diff --git a/sources/configure.ac b/sources/configure.ac
index 63bc0ab..3f8c688 100644
--- a/sources/configure.ac
+++ b/sources/configure.ac
@@ -16,7 +16,7 @@ AC_PATH_PROG(RM, rm, /bin/rm)
 AC_PATH_PROG(RMDIR, rmdir, /bin/rmdir)
 
 # Checks for header files.
-AC_CHECK_HEADERS([time.h limits.h stdlib.h string.h sys/time.h unistd.h])
+AC_CHECK_HEADERS([time.h limits.h stdlib.h string.h sys/time.h unistd.h langinfo.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_TYPE_SIZE_T
diff --git a/sources/libjalali/jalali.c b/sources/libjalali/jalali.c
index a531514..d7de8db 100644
--- a/sources/libjalali/jalali.c
+++ b/sources/libjalali/jalali.c
@@ -45,6 +45,69 @@
     }                                                                          \
   }
 
+/** Set locale from the environment.
+ *
+ * In case `HAVE_LANGINFO_H` (`langinfo.h` is defined), this will set the
+ * locale, in any other case, does nothing.
+ */
+void setlocale_from_env() {
+#ifdef HAVE_LANGINFO_H
+  setlocale(LC_ALL, "");
+#endif /* HAVE_LANGINFO_H */
+}
+
+char *abdow(int __item) {
+#ifdef HAVE_LANGINFO_H
+#define __CASE_NL(n, fallback)                                                 \
+  case n:                                                                      \
+    return nl_langinfo(ABDAY_##n)
+#else /* !HAVE_LANGINFO_H */
+#define __CASE_NL(n, fallback)                                                 \
+  case n:                                                                      \
+    return (char *)fallback
+#endif /* HAVE_LANGINFO_H */
+
+  switch (__item) {
+    __CASE_NL(1, "Sun");
+    __CASE_NL(2, "Mon");
+    __CASE_NL(3, "Tue");
+    __CASE_NL(4, "Wed");
+    __CASE_NL(5, "Thu");
+    __CASE_NL(6, "Fri");
+    __CASE_NL(7, "Sat");
+  default:
+    return (char *)"";
+  }
+
+#undef __CASE_NL
+}
+
+char *dow(int __item) {
+#ifdef HAVE_LANGINFO_H
+#define __CASE_NL(n, fallback)                                                 \
+  case n:                                                                      \
+    return nl_langinfo(DAY_##n)
+#else /* !HAVE_LANGINFO_H */
+#define __CASE_NL(n, fallback)                                                 \
+  case n:                                                                      \
+    return (char *)fallback
+#endif /* HAVE_LANGINFO_H */
+
+  switch (__item) {
+    __CASE_NL(1, "Sunday");
+    __CASE_NL(2, "Monday");
+    __CASE_NL(3, "Tuesday");
+    __CASE_NL(4, "Wednesday");
+    __CASE_NL(5, "Thursday");
+    __CASE_NL(6, "Friday");
+    __CASE_NL(7, "Saturday");
+  default:
+    return (char *)"";
+  }
+
+#undef __CASE_NL
+}
+
 const int cycle_patterns[] = {J_PT0, J_PT1, J_PT2, J_PT3, INT_MAX};
 const int leaps[] = {J_L0, J_L1, J_L2, J_L3, INT_MAX};
 
diff --git a/sources/libjalali/jalali.h b/sources/libjalali/jalali.h
index 3729e90..bf1af6f 100644
--- a/sources/libjalali/jalali.h
+++ b/sources/libjalali/jalali.h
@@ -33,6 +33,48 @@ extern "C" {
 
 #define LIBJALALI_VERSION "0.5.1"
 
+#ifdef HAVE_LANGINFO_H
+#include <langinfo.h>
+#include <locale.h>
+#endif /* HAVE_LANGINFO_H */
+
+/** Set locale from the environment.
+ *
+ * In case `HAVE_LANGINFO_H` (`langinfo.h` is defined), this will set the
+ * locale, in any other case, does nothing.
+ */
+void setlocale_from_env();
+
+/** Return the day of week in a locale or English for 1 to 7 (Sun = 1).
+ *
+ * In case `HAVE_LANGINFO_H` (`langinfo.h` is defined), this will use `DAY_n`
+ * in localized context, otherwise, it's just hardcoded English days of week.
+ *
+ * @return the localized name of the day of the week or empty if not 1-7.
+ */
+char *dow(int __item);
+
+/** Return the first 3 letters of `dow` in a locale for 1 to 7 (Sun = 1).
+ *
+ * This function is exactly as `dow`, see that for more information.
+ *
+ * There is no guarantee that this will return a string equal to 3, less or
+ * more since this might be set from the locales. The user must check the length
+ * and prepare proper paddings and else when using the abbrevations. Also, this
+ * string is ASCII hence slicing into it manually may lead to invalid
+ * characters.
+ *
+ * For this very reason, there is no "3 letters only" or "2 letters only"
+ * variations of this function as before.
+ */
+char *abdow(int __item);
+
+/** Do as in `dow` but Saturday is 0 instead of 7. */
+#define DOW06(n) (dow((n == 0) ? 7 : n))
+
+/** Do as in `abdow` but Saturday is 0 instead of 7. */
+#define ABDOW06(n) (abdow((n == 0) ? 7 : n))
+
 struct jtm {
   int tm_sec;          /* Seconds. (0-59) */
   int tm_min;          /* Minutes. (0-59) */
diff --git a/sources/libjalali/jtime.c b/sources/libjalali/jtime.c
index e30e04d..fc4a128 100644
--- a/sources/libjalali/jtime.c
+++ b/sources/libjalali/jtime.c
@@ -29,36 +29,11 @@
 #include "jtime.h"
 
 const char *GMT_ZONE = "UTC";
-const char *GMT_ZONE_fa = "گرینویچ";
 const char *jalali_months[] = {
     "Farvardin", "Ordibehesht", "Khordaad", "Tir", "Mordaad", "Shahrivar",
     "Mehr",      "Aabaan",      "Aazar",    "Dey", "Bahman",  "Esfand"};
-const char *fa_jalali_months[] = {"فروردین", "اردیبهشت", "خرداد", "تیر",
-                                  "مرداد",   "شهریور",   "مهر",   "آبان",
-                                  "آذر",     "دی",       "بهمن",  "اسفند"};
-const char *jalali_months_3[] = {"Far", "Ord", "Kho", "Tir", "Mor", "Sha",
-                                 "Meh", "Aba", "Aza", "Dey", "Bah", "Esf"};
-const char *fa_jalali_months_3[] = {"فرو", "ارد", "خرد", "تیر", "مرد", "شهر",
-                                    "مهر", "آبا", "آذر", "دی ", "بهم", "اسف"};
-const char *jalali_days_fa[] = {
-    "Shanbeh",         "Yek-Shanbeh",  "Do-Shanbeh", "Seh-Shanbeh",
-    "Chahaar-Shanbeh", "Panj-Shanbeh", "Jomeh"};
-const char *fa_jalali_days[] = {"شنبه",     "یکشنبه",  "دوشنبه", "سه شنبه",
-                                "چهارشنبه", "پنجشنبه", "جمعه"};
-const char *jalali_days_3_fa[] = {"Sha", "Yek", "Dos", "Ses",
-                                  "Cha", "Pan", "Jom"};
-const char *fa_jalali_days_3[] = {"شنب", "یکش", "دوش", "سهش",
-                                  "چها", "پنج", "جمع"};
-const char *jalali_days_2_fa[] = {"Sh", "Ye", "Do", "Se", "Ch", "Pa", "Jo"};
-
-const char *fa_jalali_days_2[] = {"شن", "یک", "دو", "سه", "چه", "پن", "جم"};
-const char *jalali_days[] = {"Saturday",  "Sunday",   "Monday", "Tuesday",
-                             "Wednesday", "Thursday", "Friday"};
-const char *jalali_days_3[] = {"Sat", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri"};
-const char *jalali_days_2[] = {"Sa", "Su", "Mo", "Tu", "We", "Th", "Fr"};
-const char *farsi_digits[] = {"۰", "۱", "۲", "۳", "۴", "۵", "۶", "۷", "۸", "۹"};
-
-const char *tzname_fa[2] = {"زمان زمستانی", "زمان تابستانی"};
+const char *ab_jalali_months[] = {"Far", "Ord", "Kho", "Tir", "Mor", "Sha",
+                                  "Meh", "Aba", "Aza", "Dey", "Bah", "Esf"};
 
 static char in_buf[MAX_BUF_SIZE] = {0};
 static struct jtm in_jtm;
@@ -80,14 +55,13 @@ void in_jasctime(const struct jtm *jtm, char *buf) {
     return;
 
   if (buf) {
-    sprintf(buf, "%s %s %02d %02d:%02d:%02d %d\n",
-            jalali_days_3_fa[jtm->tm_wday], jalali_months_3[jtm->tm_mon],
-            jtm->tm_mday, jtm->tm_hour, jtm->tm_min, jtm->tm_sec, jtm->tm_year);
+    sprintf(buf, "%s %s %02d %02d:%02d:%02d %d\n", ABDOW06(jtm->tm_wday),
+            ab_jalali_months[jtm->tm_mon], jtm->tm_mday, jtm->tm_hour,
+            jtm->tm_min, jtm->tm_sec, jtm->tm_year);
   } else {
     snprintf(in_buf, MAX_BUF_SIZE, "%s %s %02d %02d:%02d:%02d %d\n",
-             jalali_days_3_fa[jtm->tm_wday], jalali_months_3[jtm->tm_mon],
-             jtm->tm_mday, jtm->tm_hour, jtm->tm_min, jtm->tm_sec,
-             jtm->tm_year);
+             ABDOW06(jtm->tm_wday), ab_jalali_months[jtm->tm_mon], jtm->tm_mday,
+             jtm->tm_hour, jtm->tm_min, jtm->tm_sec, jtm->tm_year);
   }
 }
 
@@ -249,17 +223,17 @@ size_t jstrftime(char *s, size_t max, const char *format,
       switch (format[i + 1]) {
         /* The abbreviated weekday name. */
       case 'a':
-        strncpy(buf, jalali_days_3[jtm->tm_wday], MAX_BUF_SIZE);
+        strncpy(buf, ABDOW06(jtm->tm_wday), MAX_BUF_SIZE);
         break;
 
         /* The full weekday name. */
       case 'A':
-        strncpy(buf, jalali_days[jtm->tm_wday], MAX_BUF_SIZE);
+        strncpy(buf, DOW06(jtm->tm_wday), MAX_BUF_SIZE);
         break;
 
         /* The abbreviated month name. */
       case 'b':
-        strncpy(buf, jalali_months_3[jtm->tm_mon], MAX_BUF_SIZE);
+        strncpy(buf, ab_jalali_months[jtm->tm_mon], MAX_BUF_SIZE);
         break;
 
         /* The full month name. */
@@ -274,8 +248,8 @@ size_t jstrftime(char *s, size_t max, const char *format,
       case 'c':
         tzset();
         snprintf(buf, MAX_BUF_SIZE, "%s %d %s %d %02d:%02d:%02d %s",
-                 jalali_days_3_fa[jtm->tm_wday], jtm->tm_mday,
-                 jalali_months_3[jtm->tm_mon], jtm->tm_year, jtm->tm_hour,
+                 ABDOW06(jtm->tm_wday), jtm->tm_mday,
+                 ab_jalali_months[jtm->tm_mon], jtm->tm_year, jtm->tm_hour,
                  jtm->tm_min, jtm->tm_sec, jtm->tm_zone);
         break;
 
@@ -303,25 +277,6 @@ size_t jstrftime(char *s, size_t max, const char *format,
         snprintf(buf, MAX_BUF_SIZE, "%2d", jtm->tm_mday);
         break;
 
-        /*
-         * The preferred date and time representation in Farsi. (utf8)
-         * example: سه شنبه ۱۷ خرداد ۱۳۹۰، ساعت ۰۸:۱۹:۲۳ (IRDT)
-         */
-      case 'E':
-        tzset();
-        jalali_to_farsi(_l1, 10, 2, "۰", jtm->tm_hour);
-        jalali_to_farsi(_l2, 10, 2, "۰", jtm->tm_min);
-        jalali_to_farsi(_l3, 10, 2, "۰", jtm->tm_sec);
-        jalali_to_farsi(_la, 100, 2, "۰", jtm->tm_mday);
-        jalali_to_farsi(_lb, 100, 0, " ", jtm->tm_year);
-        snprintf(buf, MAX_BUF_SIZE, "%s %s %s %s، ساعت %s:%s:%s - %s",
-                 fa_jalali_days[jtm->tm_wday], _la,
-                 fa_jalali_months[jtm->tm_mon], _lb, _l1, _l2, _l3,
-                 (jtm->tm_zone == GMT_ZONE) ? GMT_ZONE_fa
-                                            : tzname_fa[jtm->tm_isdst]);
-
-        break;
-
         /*
          * Equivalent to %Y-%m-%d (similar to the ISO 8601 date format).
          */
@@ -330,36 +285,6 @@ size_t jstrftime(char *s, size_t max, const char *format,
                  jtm->tm_mon + 1, jtm->tm_mday);
         break;
 
-        /* The abbreviated weekday name. (Farsi-UTF8) */
-      case 'g':
-        strncpy(buf, fa_jalali_days_3[jtm->tm_wday], MAX_BUF_SIZE);
-        break;
-
-        /* The full weekday name. (Farsi-UTF8) */
-      case 'G':
-        strncpy(buf, fa_jalali_days[jtm->tm_wday], MAX_BUF_SIZE);
-        break;
-
-        /* The abbreviated month name. (Farsi-UTF8) */
-      case 'v':
-        strncpy(buf, fa_jalali_months_3[jtm->tm_mon], MAX_BUF_SIZE);
-        break;
-
-        /* The full month name. (Farsi-UTF8) */
-      case 'V':
-        strncpy(buf, fa_jalali_months[jtm->tm_mon], MAX_BUF_SIZE);
-        break;
-
-        /* The abbreviated weekday name. (Farsi) */
-      case 'h':
-        strncpy(buf, jalali_days_3_fa[jtm->tm_wday], MAX_BUF_SIZE);
-        break;
-
-        /* The full weekday name. (Farsi) */
-      case 'q':
-        strncpy(buf, jalali_days_fa[jtm->tm_wday], MAX_BUF_SIZE);
-        break;
-
         /*
          * The hour as a decimal number using a 24-hour clock
          * (range 00 to 23).
@@ -420,15 +345,6 @@ size_t jstrftime(char *s, size_t max, const char *format,
         snprintf(buf, MAX_BUF_SIZE, "\n");
         break;
 
-        /*
-         * Either "ق.ظ" or "ب.ظ" according to the given time value.
-         * Noon is treated as "ق.ظ" and midnight as "ب.ظ".
-         */
-      case 'O':
-        snprintf(buf, MAX_BUF_SIZE, "%s",
-                 (jtm->tm_hour >= 0 && jtm->tm_hour < 12) ? "ق.ظ" : "ب.ظ");
-        break;
-
         /*
          * Either "AM" or "PM" according to the given time value.
          * Noon is treated as "PM" and midnight as "AM".
@@ -518,36 +434,12 @@ size_t jstrftime(char *s, size_t max, const char *format,
         snprintf(buf, MAX_BUF_SIZE, "%d", jtm->tm_wday);
         break;
 
-        /*
-         * The preferred date representation without the time
-         * in Farsi. (utf8)
-         */
-      case 'W':
-        jalali_to_farsi(_la, 100, 0, " ", jtm->tm_year);
-        jalali_to_farsi(_l1, 10, 2, "۰", jtm->tm_mon + 1);
-        jalali_to_farsi(_l2, 10, 2, "۰", jtm->tm_mday);
-
-        snprintf(buf, MAX_BUF_SIZE, "%s/%s/%s", _la, _l1, _l2);
-        break;
-
         /* The preferred date representation without the time. */
       case 'x':
         snprintf(buf, MAX_BUF_SIZE, "%02d/%02d/%d", jtm->tm_mday,
                  jtm->tm_mon + 1, jtm->tm_year);
         break;
 
-        /*
-         * The preferred time representation in Farsi. (utf8)
-         */
-      case 'X':
-        jalali_to_farsi(_l1, 10, 2, "۰", jtm->tm_hour);
-        jalali_to_farsi(_l2, 10, 2, "۰", jtm->tm_min);
-        jalali_to_farsi(_l3, 10, 2, "۰", jtm->tm_sec);
-
-        snprintf(buf, MAX_BUF_SIZE, "%s:%s:%s", _l1, _l2, _l3);
-
-        break;
-
         /*
          * The year as a decimal number without a century
          * (range 00 to 99).
@@ -689,26 +581,28 @@ char *jstrptime(const char *s, const char *format, struct jtm *jtm) {
     switch (fd) {
       /* The abbreviated or full weekday name. */
     case 'a':
-    case 'A':
-      ptr = (fd == 'a') ? (char **)jalali_days_3 : (char **)jalali_days;
-      f = 0;
-
       for (k = 0; k < J_WEEK_LENGTH; k++) {
-        if (!strcasecmp(buf, ptr[k])) {
+        if (!strcasecmp(buf, ABDOW06(k))) {
           jtm->tm_wday = k;
-          f = 1;
+          break;
         }
       }
+      return (char *)&s[i];
 
-      if (!f)
-        return (char *)&s[i];
-
-      break;
+      /* The full weekday name. */
+    case 'A':
+      for (k = 0; k < J_WEEK_LENGTH; k++) {
+        if (!strcasecmp(buf, DOW06(k))) {
+          jtm->tm_wday = k;
+          break;
+        }
+      }
+      return (char *)&s[i];
 
       /* The abbreviated or full month name. */
     case 'b':
     case 'B':
-      ptr = (fd == 'b') ? (char **)jalali_months_3 : (char **)jalali_months;
+      ptr = (fd == 'b') ? (char **)ab_jalali_months : (char **)jalali_months;
       f = 0;
 
       for (k = 0; k < J_YEAR_LENGTH_IN_MONTHS; k++) {
@@ -781,24 +675,6 @@ char *jstrptime(const char *s, const char *format, struct jtm *jtm) {
       jtm->tm_year = atoi(buf);
       break;
 
-      /* The abbreviated or full weekday name. (Farsi) */
-    case 'q':
-    case 'h':
-      ptr = (fd == 'h') ? (char **)jalali_days_3_fa : (char **)jalali_days_fa;
-      f = 0;
-
-      for (k = 0; k < J_WEEK_LENGTH; k++) {
-        if (!strcasecmp(buf, ptr[k])) {
-          jtm->tm_wday = k;
-          f = 1;
-        }
-      }
-
-      if (!f)
-        return (char *)&s[i];
-
-      break;
-
     default:
       break;
     }
@@ -846,45 +722,3 @@ char *jctime_r(const time_t *timep, char *buf) {
 
   return buf;
 }
-
-/*
- * @Utils
- * Utility functions for internal use.
- * jalali_to_farsi() converts an integer's digits to Arabic-Indic
- * padding works just like printf() field width.
- */
-int jalali_to_farsi(char *buf, size_t n, int padding, char *pad, int d) {
-  char _buf[100] = {0};
-  int i = 0, j = 0;
-  int p = 0;
-  int c = 0;
-  int cw = (pad[0] < 0) ? 2 : 1;
-
-  for (i = d; i != 0; c++,
-      _buf[p] = farsi_digits[i % 10 > 0 ? i % 10 : -(i % 10)][1],
-      _buf[p + 1] = farsi_digits[i % 10 > 0 ? i % 10 : -(i % 10)][0], i /= 10,
-      p += 2)
-    ;
-
-  if (d < 0) {
-    _buf[p] = '-';
-    c++;
-    p++;
-  }
-
-  _buf[p] = 0;
-  buf[0] = 0;
-  i = 0;
-
-  for (i = 0; (i < (padding - c)) && (i * cw < (int)(n - 1));
-       strcat(buf, pad), i++)
-    ;
-  buf[i * cw] = 0;
-
-  for (j = 0, i *= cw; (j < p) && (i < (int)(n - 1));
-       buf[i] = _buf[p - j - 1], i++, j++)
-    ;
-  buf[i] = 0;
-
-  return i;
-}
diff --git a/sources/man/jstrftime.3 b/sources/man/jstrftime.3
index f3882e2..3f071fa 100644
--- a/sources/man/jstrftime.3
+++ b/sources/man/jstrftime.3
@@ -80,32 +80,11 @@ Like
 The day of the month as a decimal number, but a leading
 zero is replaced by a space. (SU)
 .TP
-.B %E
-The preferred date and time in Farsi. (utf8)
-.TP
 .B %F
 Equivalent to
 .B %Y-%m-%d
 (similar to the ISO\ 8601 date format). (C99)
 .TP
-.B %h
-The abbreviated Farsi transliterated weekday name.
-.TP
-.B %q
-The full Farsi transliterated weekday name.
-.TP
-.B %g
-The abbreviated Farsi weekday name. (utf8)
-.TP
-.B %G
-The full Farsi weekday name. (utf8)
-.TP
-.B %v
-The abbreviated Farsi month name. (utf8)
-.TP
-.B %V
-The full Farsi month name. (utf8)
-.TP
 .B %H
 The hour as a decimal number using a 24-hour clock (range 00 to 23).
 .TP
@@ -138,9 +117,6 @@ The minute as a decimal number (range 00 to 59).
 .B %n
 A newline character. (SU)
 .TP
-.B %O
-AM or PM notation for the given time in Farsi equivalent. (utf8)
-.TP
 .B %p
 Either "AM" or "PM" according to the given time value.
 Noon is treated as "PM" and midnight as "AM".
@@ -190,15 +166,9 @@ The day of the week as a decimal, range 0 to 6, Saturday being 0.
 See also
 .BR %u .
 .TP
-.B %W
-The preferred date in %Y/%m/%d format and Farsi. (utf8)
-.TP
 .B %x
 The preferred date representation without the time.
 .TP
-.B %X
-The preferred time representation without the date in Farsi. (utf8)
-.TP
 .B %y
 The year as a decimal number without a century (range 00 to 99).
 .TP
diff --git a/sources/man/jstrptime.3 b/sources/man/jstrptime.3
index 4b8d28b..6ce2071 100644
--- a/sources/man/jstrptime.3
+++ b/sources/man/jstrptime.3
@@ -75,7 +75,7 @@ The
 .B %
 character.
 .TP
-.BR %a " or " %A " or " %h " or " %q
+.BR %a " or " %A
 The weekday name in abbreviated form or the full name.
 .TP
 .BR %b " or " %B
diff --git a/sources/src/jcal.c b/sources/src/jcal.c
index ff221f0..9eb09d1 100644
--- a/sources/src/jcal.c
+++ b/sources/src/jcal.c
@@ -29,15 +29,6 @@
 #include "termcap.h"
 
 extern const char *jalali_months[];
-extern const char *jalali_days[];
-extern const char *jalali_days_fa[];
-extern const char *jalali_days_3[];
-extern const char *jalali_days_3_fa[];
-extern const char *jalali_days_2[];
-extern const char *jalali_days_2_fa[];
-extern const char *fa_jalali_months[];
-extern const char *fa_jalali_days_3[];
-extern const char *fa_jalali_days_2[];
 
 extern const int jalali_month_len[];
 
@@ -153,68 +144,31 @@ void show_cal_matrix(struct cal_layout *l, struct cal_matrix *mat) {
         if (mat->m[i][j] == 0)
           printf((l->julian) ? "    " : "   ");
         else if (mat->m[i][j] > 1000 && l->color) {
-          if (l->farsi) {
-            jalali_to_farsi(buf, 100, 2 + l->julian, " ", mat->m[i][j] - 1000);
-          } else {
-            snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j] - 1000);
-          }
-
+          snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j] - 1000);
           printf("%s%s%s ", TERM_BLACK_ON_WHITE, buf, TERM_RESET);
 
         } else if (mat->m[i][j] > 1000 && !l->color) {
-          if (l->farsi) {
-            jalali_to_farsi(buf, 100, 2 + l->julian, " ", mat->m[i][j] - 1000);
-          } else {
-            snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j] - 1000);
-          }
-
+          snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j] - 1000);
           printf("%s ", buf);
-
         } else {
-          if (l->farsi) {
-            jalali_to_farsi(buf, 100, 2 + l->julian, " ", mat->m[i][j]);
-          } else {
-            snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j]);
-          }
-
+          snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j]);
           printf("%s ", buf);
         }
       } else {
         if (mat->m[i][j] == 0)
           printf((l->julian) ? "   " : "  ");
         else if (mat->m[i][j] > 1000 && l->color) {
-          if (l->farsi) {
-            jalali_to_farsi(buf, 100, 2 + l->julian, " ", mat->m[i][j] - 1000);
-          } else {
-            snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j] - 1000);
-          }
-
+          snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j] - 1000);
           printf("%s%s%s", TERM_RED_ON_WHITE, buf, TERM_RESET);
 
         } else if ((mat->m[i][j] > 1000) && (!l->color)) {
-          if (l->farsi) {
-            jalali_to_farsi(buf, 100, 2 + l->julian, " ", mat->m[i][j] - 1000);
-          } else {
-            snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j] - 1000);
-          }
-
+          snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j] - 1000);
           printf("%s", buf);
         } else if (l->color) {
-          if (l->farsi) {
-            jalali_to_farsi(buf, 100, 2 + l->julian, " ", mat->m[i][j]);
-          } else {
-            snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j]);
-          }
-
+          snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j]);
           printf("%s%s%s", TERM_RED, buf, TERM_RESET);
-
         } else {
-          if (l->farsi) {
-            jalali_to_farsi(buf, 100, 2 + l->julian, " ", mat->m[i][j]);
-          } else {
-            snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j]);
-          }
-
+          snprintf(buf, 100, "%*d", 2 + l->julian, mat->m[i][j]);
           printf("%s", buf);
         }
       }
@@ -261,44 +215,26 @@ void destroy_cal_matrix(struct cal_matrix *mat) {
  */
 
 void show_cal(struct cal_layout *l, struct cal_matrix *m, struct jtm **_j) {
-  char **ptr_d;
-
+  int cell_width = (l->julian) ? 3 : 2;
   int i, k;
-  int cw = (l->farsi) ? 2 : 1;
-  int cal_width = (l->julian) ? 7 * 3 + 6 : 7 * 2 + 6;
+  int cal_width = 7 * cell_width + 6;
 
   char cal_t[3][MAX_BUF_SIZE];
   char cal_y[3][100];
   int cal_tw[3];
   char buf[100];
 
-  if (l->farsi)
-    ptr_d = (l->julian) ? (char **)fa_jalali_days_3 : (char **)fa_jalali_days_2;
-  else if (l->english)
-    ptr_d = (l->julian) ? (char **)jalali_days_3 : (char **)jalali_days_2;
-  else
-    ptr_d = (l->julian) ? (char **)jalali_days_3_fa : (char **)jalali_days_2_fa;
-
   for (i = 0; i < m->n; i++) {
-    if (l->farsi) {
-      jalali_to_farsi(buf, 100, 0, " ",
-                      _j[i]->tm_year +
-                          ((l->pahlavi) ? PAHLAVI_ISLAMIC_DIFF : 0));
-    } else {
-      snprintf(buf, 100, "%d",
-               _j[i]->tm_year + ((l->pahlavi) ? PAHLAVI_ISLAMIC_DIFF : 0));
-    }
-    snprintf(cal_y[i], 100, "%s%s", buf,
-             (l->pahlavi) ? ((l->farsi) ? " په" : "(pa)") : "");
+    snprintf(buf, 100, "%d",
+             _j[i]->tm_year + ((l->pahlavi) ? PAHLAVI_ISLAMIC_DIFF : 0));
+    snprintf(cal_y[i], 100, "%s%s", buf, (l->pahlavi) ? "(pa)" : "");
     buf[0] = 0;
   }
 
   for (i = 0; i < m->n; i++) {
-    snprintf(cal_t[i], MAX_BUF_SIZE, "%s %s",
-             (l->farsi) ? fa_jalali_months[_j[i]->tm_mon]
-                        : jalali_months[_j[i]->tm_mon],
+    snprintf(cal_t[i], MAX_BUF_SIZE, "%s %s", jalali_months[_j[i]->tm_mon],
              (l->syear) ? cal_y[i] : "");
-    cal_tw[i] = (cal_width - (strlen(cal_t[i]) / cw)) / 2;
+    cal_tw[i] = (cal_width - strlen(cal_t[i])) / 2;
   }
 
   for (i = 0; i < m->n; i++) {
@@ -313,7 +249,7 @@ void show_cal(struct cal_layout *l, struct cal_matrix *m, struct jtm **_j) {
     }
 
     for (k = 0; k < (cal_width - cal_tw[i] -
-                     (strlen(cal_t[i]) / cw + ((cw > 1) ? 1 : 0)));
+                     (strlen(cal_t[i]) + (/* (cw > 1) ? 1 : */ 0)));
          k++) {
       printf(" ");
     }
@@ -328,19 +264,16 @@ void show_cal(struct cal_layout *l, struct cal_matrix *m, struct jtm **_j) {
   printf("\n");
 
   for (i = 0; i < m->n; i++) {
-    for (k = 0; k < 6; k++) {
+    for (k = 0; k < 7; k++) {
+      char *s = ABDOW06(k);
       if (l->color) {
-        printf("%s%s%s ", TERM_WHITE, ptr_d[k], TERM_RESET);
+        printf("%s%*.*s%s ", k == 6 ? TERM_RED : TERM_WHITE, cell_width,
+               cell_width, s, TERM_RESET);
       } else {
-        printf("%s ", ptr_d[k]);
+        printf("%*.*s ", cell_width, cell_width, s);
       }
     }
 
-    if (l->color)
-      printf("%s%s%s", TERM_RED, ptr_d[6], TERM_RESET);
-    else
-      printf("%s", ptr_d[6]);
-
     if (i != m->n - 1) {
       for (k = 0; k < l->margin; k++) {
         printf(" ");
@@ -441,16 +374,10 @@ void show_year(struct cal_layout *l, struct jtm *j) {
   int cal_tw;
   int i;
 
-  if (l->farsi) {
-    jalali_to_farsi(buf, 100, 0, " ",
-                    j->tm_year + ((l->pahlavi) ? PAHLAVI_ISLAMIC_DIFF : 0));
-  } else {
-    snprintf(buf, 100, "%d",
-             j->tm_year + ((l->pahlavi) ? PAHLAVI_ISLAMIC_DIFF : 0));
-  }
+  snprintf(buf, 100, "%d",
+           j->tm_year + ((l->pahlavi) ? PAHLAVI_ISLAMIC_DIFF : 0));
 
-  snprintf(title, 100, "%s%s", buf,
-           (l->pahlavi) ? (l->farsi ? " پهلوی" : " (Pahlavi)") : "");
+  snprintf(title, 100, "%s%s", buf, (l->pahlavi) ? " (Pahlavi)" : "");
 
   cal_tw = (cal_width - strlen(title)) / 2;
 
@@ -488,6 +415,8 @@ void show_year(struct cal_layout *l, struct jtm *j) {
 }
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   struct cal_layout l;
   struct jtm j = {0};
   time_t t;
@@ -508,9 +437,7 @@ int main(int argc, char **argv) {
 
   l.color = 1;
   l.pahlavi = 0;
-  l.farsi = 0;
   l.julian = 0;
-  l.english = 0;
   l.margin = 3;
 
   /* Parsing date values. (YYYY MM DD) */
@@ -552,21 +479,11 @@ int main(int argc, char **argv) {
       l.pahlavi = 1;
       break;
 
-    case 'p':
-      l.farsi = 1;
-      l.english = 0;
-      break;
-
       /* Displays Julian days (Day of year) instead of day of month.  */
     case 'j':
       l.julian = 1;
       break;
 
-      /* Displays English names of weekdays. */
-    case 'e':
-      l.english = 1;
-      break;
-
       /* Display one-month calendar for a given date. */
     case '1':
       show = &show_1;
diff --git a/sources/src/jcal.h b/sources/src/jcal.h
index e0980fd..30fdaae 100644
--- a/sources/src/jcal.h
+++ b/sources/src/jcal.h
@@ -33,8 +33,6 @@ struct cal_layout {
   int color;   /* If enabled, drawer tries to colorize output. */
   int julian;  /* Displays julian days (1-366) instead of month days. */
   int pahlavi; /* jcal uses Pahlavi instead of Islamic epoch. */
-  int english; /* Use Farsi transliteration for weekday names. */
-  int farsi;   /* Use Farsi utf8 names and numbers. */
   int margin;  /* Marginal space between two cals. */
   int syear;   /* If enabled, jcal shows year above cals. */
 };
diff --git a/sources/src/jdate.c b/sources/src/jdate.c
index 29094bd..3eb4990 100644
--- a/sources/src/jdate.c
+++ b/sources/src/jdate.c
@@ -58,6 +58,8 @@ int mod_time(const char *path, time_t *t, int a) {
 }
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   int opt;
   int i;
   int err;
diff --git a/sources/test_kit/jalali/elc.c b/sources/test_kit/jalali/elc.c
index 26fcd09..acf1620 100644
--- a/sources/test_kit/jalali/elc.c
+++ b/sources/test_kit/jalali/elc.c
@@ -4,6 +4,8 @@
 #include "jalali.h"
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   if (argc != 3) {
     printf("wrong arguments given\n");
     printf("elc: leap counter from YEAR1 to YEAR2\n");
diff --git a/sources/test_kit/jalali/get_date.c b/sources/test_kit/jalali/get_date.c
index 8acb81f..c0d9af1 100644
--- a/sources/test_kit/jalali/get_date.c
+++ b/sources/test_kit/jalali/get_date.c
@@ -4,6 +4,8 @@
 #include "jalali.h"
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   if (argc != 2) {
     printf("wrong arguments given\n");
     printf("usage: get_date DIFF_FROM_EPOCH_BY_DAYS\n");
diff --git a/sources/test_kit/jalali/get_diff.c b/sources/test_kit/jalali/get_diff.c
index a9b54e2..43e4248 100644
--- a/sources/test_kit/jalali/get_diff.c
+++ b/sources/test_kit/jalali/get_diff.c
@@ -4,6 +4,8 @@
 #include "jalali.h"
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   if (argc != 4) {
     printf("wrong arguments given\n");
     printf("usage: get_diff DAY MONTH YEAR\n");
diff --git a/sources/test_kit/jalali/jalali_update.c b/sources/test_kit/jalali/jalali_update.c
index eae2468..01b274a 100644
--- a/sources/test_kit/jalali/jalali_update.c
+++ b/sources/test_kit/jalali/jalali_update.c
@@ -5,6 +5,8 @@
 #include "jtime.h"
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   time_t t;
   struct jtm j;
   int mday_diff = 60;
diff --git a/sources/test_kit/jalali/jyinfo.c b/sources/test_kit/jalali/jyinfo.c
index 0550aba..468719b 100644
--- a/sources/test_kit/jalali/jyinfo.c
+++ b/sources/test_kit/jalali/jyinfo.c
@@ -4,6 +4,8 @@
 #include "jalali.h"
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   struct jyinfo a;
 
   if (argc != 2) {
diff --git a/sources/test_kit/jalali/leap.c b/sources/test_kit/jalali/leap.c
index cb77416..11cd26b 100644
--- a/sources/test_kit/jalali/leap.c
+++ b/sources/test_kit/jalali/leap.c
@@ -4,6 +4,8 @@
 #include "jalali.h"
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   if (argc != 2) {
     printf("wrong arguments given\n");
     printf("usage: leap YEAR\n");
diff --git a/sources/test_kit/jalali/sec_converter.c b/sources/test_kit/jalali/sec_converter.c
index f3b9fc8..192c2f7 100644
--- a/sources/test_kit/jalali/sec_converter.c
+++ b/sources/test_kit/jalali/sec_converter.c
@@ -4,6 +4,8 @@
 #include "jalali.h"
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   if (argc != 2) {
     printf("wrong arguments given\n");
     printf("usage: sec_converter SECONDS\n");
diff --git a/sources/test_kit/jtime/jasctime.c b/sources/test_kit/jtime/jasctime.c
index e3770ba..66e53fe 100644
--- a/sources/test_kit/jtime/jasctime.c
+++ b/sources/test_kit/jtime/jasctime.c
@@ -5,6 +5,8 @@
 #include "jtime.h"
 
 int main() {
+  setlocale_from_env();
+
   time_t ltime;
   time(&ltime);
   struct ab_jtm a;
diff --git a/sources/test_kit/jtime/jctime.c b/sources/test_kit/jtime/jctime.c
index 26ebb20..d2727f0 100644
--- a/sources/test_kit/jtime/jctime.c
+++ b/sources/test_kit/jtime/jctime.c
@@ -5,6 +5,8 @@
 #include "jtime.h"
 
 int main() {
+  setlocale_from_env();
+
   time_t t;
   time(&t);
   struct jtm j;
diff --git a/sources/test_kit/jtime/jgmtime.c b/sources/test_kit/jtime/jgmtime.c
index d9eb7bc..ba1e985 100644
--- a/sources/test_kit/jtime/jgmtime.c
+++ b/sources/test_kit/jtime/jgmtime.c
@@ -5,6 +5,8 @@
 #include "jtime.h"
 
 int main() {
+  setlocale_from_env();
+
   time_t t;
   time(&t);
   struct jtm j;
diff --git a/sources/test_kit/jtime/jlocaltime.c b/sources/test_kit/jtime/jlocaltime.c
index ce53a96..10e77b6 100644
--- a/sources/test_kit/jtime/jlocaltime.c
+++ b/sources/test_kit/jtime/jlocaltime.c
@@ -5,6 +5,8 @@
 #include "jtime.h"
 
 int main() {
+  setlocale_from_env();
+
   time_t t;
   time(&t);
   struct jtm *p;
diff --git a/sources/test_kit/jtime/jmktime.c b/sources/test_kit/jtime/jmktime.c
index bbafe69..adf1b39 100644
--- a/sources/test_kit/jtime/jmktime.c
+++ b/sources/test_kit/jtime/jmktime.c
@@ -5,6 +5,8 @@
 #include "jtime.h"
 
 int main() {
+  setlocale_from_env();
+
   time_t t;
   time(&t);
   struct jtm j;
diff --git a/sources/test_kit/jtime/jstrftime.c b/sources/test_kit/jtime/jstrftime.c
index 608107c..da77245 100644
--- a/sources/test_kit/jtime/jstrftime.c
+++ b/sources/test_kit/jtime/jstrftime.c
@@ -6,6 +6,8 @@
 #include "jtime.h"
 
 int main(int argc, char **argv) {
+  setlocale_from_env();
+
   if (argc != 2) {
     printf("wrong arguments given\n");
     printf("usage jstrftime FORMAT\n");
diff --git a/sources/test_kit/jtime/jstrptime.c b/sources/test_kit/jtime/jstrptime.c
index 86e7fea..38946da 100644
--- a/sources/test_kit/jtime/jstrptime.c
+++ b/sources/test_kit/jtime/jstrptime.c
@@ -8,6 +8,8 @@
 #include "jtime.h"
 
 int main() {
+  setlocale_from_env();
+
   char *s;
   char *fmt;
   s = readline("string > ");