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<title>Diggernaut: Documentation for Meta-Language | Iterators | Iterator by Date</title>
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<h1>Iterators</h1>
<div>
<h2>Iterator by Dates</h2>
<p class="flow-text">
Iterators like <span class = "hlt2">date</span> are used in cases where you need to
create a set of ordered dates. For example, if you use the search form with date field on the source site to
retrieve data just for specific date (or period). When you set up such iterator, you can specify the start date, the interval in days between
each iteration, the period that sets the end date for the iterations, and a template that describes format of dates for arguments.
</p>
<table class="responsive-table highlight">
<thead>
<tr>
<th data-field="parameter">Parameter</th>
<th data-field="description">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="centered">type</td>
<td>The constant that defines the iterator type, has the value <span class="hlt2">date</span>.</td>
</tr>
<tr>
<td>start</td>
<td>Start date for iterations in YYYY-MM-DD format, if omitted, system will use current date as start date (optional).</td>
</tr>
<tr>
<td>end</td>
<td>End date for iterations in YYYY-MM-DD format, if omitted, system will use period parameter (optional).</td>
</tr>
<tr>
<td>period</td>
<td>Period duration in days between start and end dates, if omitted, defaulted to 60 days (optional).</td>
</tr>
<tr>
<td>interval</td>
<td>Interval in days between iterations. Eg if you want to have agruments for each date between start and end dates, set interval to 1.
If you need weekly intervals, set it to 7. If parameter is omitted, system will use default value 1.
(optional).
</td>
</tr>
<tr>
<td>template</td>
<td>Template, used to format values in argument fields start_date and end_date, formed by iterator (optional).</td>
</tr>
</tbody>
</table>
<p class="flow-text">
In the table below, you can find all possible tags that can be used in the template and examples of usage:
</p>
<table class="responsive-table highlight">
<thead>
<tr>
<th data-field="tag">Tag</th>
<th data-field="description" width="60%">Description</th>
<th data-field="sample">Template Example</th>
<th data-field="value">Value Sample</th>
</tr>
</thead>
<tbody>
<tr>
<td class="centered">%a</td>
<td>abbreviation for weekdays, eg <span class="hlt">Mon</span> or <span class="hlt">Fri</span></td>
<td>%a, %d %B</td>
<td>Fri, 20 February</td>
</tr>
<tr>
<td class="centered">%A</td>
<td>weekday, eg <span class="hlt">Monday</span> or <span class="hlt">Friday</span></td>
<td>%A, %d %B</td>
<td>Friday, 20 February</td>
</tr>
<tr>
<td class="centered">%b</td>
<td>month abbreviation, eg <span class="hlt">Feb</span> or <span class="hlt">Sep</span></td>
<td>%A, %d %b</td>
<td>Friday, 20 Jun</td>
</tr>
<tr>
<td class="centered">%B</td>
<td>month name, eg <span class="hlt">February</span> or <span class="hlt">September</span></td>
<td>%A, %d %B</td>
<td>Friday, 20 June</td>
</tr>
<tr>
<td class="centered">%C</td>
<td>number of century, takes values from <span class="hlt">00</span> to <span class="hlt">99</span></td>
<td>%С/%y</td>
<td>20/17</td>
</tr>
<tr>
<td class="centered">%d</td>
<td>day of month, takes values from <span class="hlt">01</span> to <span class="hlt">31</span></td>
<td>%Y-%m-%d</td>
<td>2017-10-01</td>
</tr>
<tr>
<td class="centered">%D</td>
<td>preset template, same as <span class="hlt">%m/%d/%y</span></td>
<td>%D</td>
<td>05/08/17</td>
</tr>
<tr>
<td class="centered">%e</td>
<td>day of month, takes values from <span class="hlt">1</span> to <span class="hlt">31</span></td>
<td>%e %B</td>
<td>5 January</td>
</tr>
<tr>
<td class="centered">%F</td>
<td>preset template, same as <span class="hlt">%Y-%m-%d</span></td>
<td>%F</td>
<td>2017-10-01</td>
</tr>
<tr>
<td class="centered">%g</td>
<td>2-digit number of year according to <span class="hlt">ISO-8601:1988</span> standard</td>
<td>%g</td>
<td>17</td>
</tr>
<tr>
<td class="centered">%G</td>
<td>4-digit number of year according to <span class="hlt">ISO-8601:1988</span> standard</td>
<td>%G</td>
<td>2017</td>
</tr>
<tr>
<td class="centered">%h</td>
<td>same as <span class="hlt">%b%</span></td>
<td>%A, %d %h</td>
<td>Friday, 20 Jun</td>
</tr>
<tr>
<td class="centered">%H</td>
<td>hour in 24-hours system, takes values from <span class="hlt">00</span> to <span class="hlt">23</span></td>
<td>%H:%M:%S</td>
<td>08:35:26</td>
</tr>
<tr>
<td class="centered">%I</td>
<td>hour in 12-hours system, takes values from <span class="hlt">01</span> to <span class="hlt">12</span></td>
<td>%H:%M:%S</td>
<td>08:35:26</td>
</tr>
<tr>
<td class="centered">%j</td>
<td>number of day of year, takes values from <span class="hlt">1</span> to <span class="hlt">366</span></td>
<td>Today is %j day of year</td>
<td>Today is 183 day of year</td>
</tr>
<tr>
<td class="centered">%k</td>
<td>hour in 24-hours system, takes values from <span class="hlt">0</span> to <span class="hlt">23</span></td>
<td>%k hrs %M mnt</td>
<td>8 hrs 35 mnt</td>
</tr>
<tr>
<td class="centered">%l</td>
<td>hour in 12-hours system, takes values from <span class="hlt">1</span> to <span class="hlt">12</span></td>
<td>%l hrs %M mnt</td>
<td>8 hrs 35 mnt</td>
</tr>
<tr>
<td class="centered">%m</td>
<td>number of month, takes values from <span class="hlt">01</span> to <span class="hlt">12</span></td>
<td>%Y-%m-%d</td>
<td>2017-10-01</td>
</tr>
<tr>
<td class="centered">%l</td>
<td>minutes, takes values from <span class="hlt">00</span> to <span class="hlt">59</span></td>
<td>%l hrs %M mnt</td>
<td>8 hrs 35 mnt</td>
</tr>
<tr>
<td class="centered">%n</td>
<td>new line symbol</td>
<td>%Y%n%m</td>
<td>2017\n10</td>
</tr>
<tr>
<td class="centered">%p</td>
<td>value <span class="hlt">AM</span> or <span class="hlt">PM</span> depending on time, used with 12-hours time system</td>
<td>%I%p</td>
<td>8AM</td>
</tr>
<tr>
<td class="centered">%P</td>
<td>value <span class="hlt">am</span> or <span class="hlt">pm</span> depending on time, used with 12-hours time system</td>
<td>%I%P</td>
<td>8am</td>
</tr>
<tr>
<td class="centered">%r</td>
<td>same as <span class="hlt">%I:%M:%S %p</span></td>
<td>%r</td>
<td>04:12:37 PM</td>
</tr>
<tr>
<td class="centered">%R</td>
<td>same as <span class="hlt">%H:%M</span></td>
<td>%R</td>
<td>22:35</td>
</tr>
<tr>
<td class="centered">%s</td>
<td>Unix timestamp, shows number of seconds since start of epoch (1 january 1970)</td>
<td>%s</td>
<td>1506867213</td>
</tr>
<tr>
<td class="centered">%S</td>
<td>seconds, takes values from <span class="hlt">00</span> to <span class="hlt">59</span></td>
<td>%H:%M:%S</td>
<td>08:35:26</td>
</tr>
<tr>
<td class="centered">%t</td>
<td>tabulation symbol</td>
<td>%Y%t%m</td>
<td>2017\t10</td>
</tr>
<tr>
<td class="centered">%T</td>
<td>same as <span class="hlt">%H:%M:%S</span></td>
<td>%T</td>
<td>08:35:26</td>
</tr>
<tr>
<td class="centered">%u</td>
<td>number of weekday from <span class="hlt">1</span> (monday) to <span class="hlt">7</span> (sunday)</td>
<td>Today is %u week day</td>
<td>Today is 5 week day</td>
</tr>
<tr>
<td class="centered">%U</td>
<td>number of week of year, if week starts with Sunday, takes values from <span class="hlt">00</span> to <span class="hlt">53</span></td>
<td>It was %U week</td>
<td>It was 23 week</td>
</tr>
<tr>
<td class="centered">%V</td>
<td>number of week of year by ISO standard, if week starts with Monday, takes values from <span class="hlt">01</span> to <span class="hlt">53</span>.
If week with 1 Jan has 4 or more days in new year, this week is counted as first week of new year, in other case its counted as last week of previous year.
</td>
<td>It was %V week</td>
<td>It was 23 week</td>
</tr>
<tr>
<td class="centered">%w</td>
<td>number of day of week from <span class="hlt">0</span> (sunday) to <span class="hlt">6</span> (saturday)</td>
<td>Today is %w day of week</td>
<td>Today is 5 day of week</td>
</tr>
<tr>
<td class="centered">%W</td>
<td>number of week of year, if week starts with monday, takes values from <span class="hlt">00</span> to <span class="hlt">53</span></td>
<td>It was %W week</td>
<td>It was 23 week</td>
</tr>
<tr>
<td class="centered">%y</td>
<td>2-digits number of year</td>
<td>%m/%d/%y</td>
<td>10/01/17</td>
</tr>
<tr>
<td class="centered">%Y</td>
<td>4-digits number of year</td>
<td>%Y-%m-%d</td>
<td>2017-10-01</td>
</tr>
<tr>
<td class="centered">%z</td>
<td>time correction value to UTC time. Showing in format like <span class="hlt">+HHMM</span>
or <span class="hlt">-HHMM</span>, where <span class="hlt">+</span> means east from GMT,
<span class="hlt">-</span> means west from GMT, HH - number of hours, MM - number of minutes.
</td>
<td>%z</td>
<td>+0300</td>
</tr>
<tr>
<td class="centered">%Z</td>
<td>abbreviation fo timezone</td>
<td>%Z</td>
<td>PST</td>
</tr>
<tr>
<td class="centered">%+</td>
<td>same as <span class="hlt">%a %b %e %H:%M:%S %Z %Y</span></td>
<td>%+</td>
<td>Mon Sep 20 13:24:55 PST 2017</td>
</tr>
<tr>
<td class="centered">%%</td>
<td>symbol %</td>
<td>%Y%%%m</td>
<td>2017%10</td>
</tr>
</tbody>
</table>
<p class="flow-text">
If you dont use template, start_date and end_date will be using ISO standard when formatted.
In addition to these two arguments, there are some other agruments in the set that can be very useful in many cases:
</p>
<table class="responsive-table highlight">
<thead>
<tr>
<th data-field="argument">Argument</th>
<th data-field="description">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="centered">start_date</td>
<td>date of the interval start, in the format described by template or ISO standard</td>
</tr>
<tr>
<td class="centered">end_date</td>
<td>date of the interval end, in the format described by template or ISO standard</td>
</tr>
<tr>
<td class="centered">start_year</td>
<td>year of the interval start, in <span class="hlt2">%Y</span> (YYYY) format</td>
</tr>
<tr>
<td class="centered">end_year</td>
<td>year of the interval end, in <span class="hlt2">%Y</span> (YYYY) format</td>
</tr>
<tr>
<td class="centered">start_yr</td>
<td>year of the interval start, in <span class="hlt2">%y</span> (YY) format</td>
</tr>
<tr>
<td class="centered">end_yr</td>
<td>year of the interval end, in <span class="hlt2">%y</span> (YY) format</td>
</tr>
<tr>
<td class="centered">start_month</td>
<td>month of the interval start, in <span class="hlt2">%m</span> (MM) format</td>
</tr>
<tr>
<td class="centered">end_month</td>
<td>month of the interval end, in <span class="hlt2">%m</span> (MM) format</td>
</tr>
</tbody>
</table>
<p class="flow-text">Example of iterator by dates:</p>
<div class="row">
<div class="col s12">
<pre class="language-yaml">
<code class="language-yaml">iterator:
- type: date
# SET INTERVAL FOR EVERY 2 DAYS
interval: 2
# PERIOD BETWEEN START DATE (IN THIS CASE CURRENT DATE, BECAUSE START DATE PARAMENTER IS OMITTED) AND END DATE IS SET TO 10 DAYS
period: 10
# TEMPLATE FOR `start_date` AND `end_date`
template: '%B %d %Y'
</code></pre>
</div>
</div>
<p class="flow-text">
As a result, we get the following list of fieldsets for each of which the digger will execute the main logic block:
</p>
<div class="row">
<div class="col s12">
<pre class="language-json">
<code class="language-json">[
{
"start_date": "October 01 2017", "end_date": "October 02 2017",
"start_year": "2017", "end_year": "2017",
"start_yr": "17", "end_yr": "17",
"start_month": "10", "end_month": "10"
},
{
"start_date": "October 03 2017", "end_date": "October 04 2017",
"start_year": "2017", "end_year": "2017",
"start_yr": "17", "end_yr": "17",
"start_month": "10", "end_month": "10"
},
{
"start_date": "October 05 2017", "end_date": "October 06 2017",
"start_year": "2017", "end_year": "2017",
"start_yr": "17", "end_yr": "17",
"start_month": "10", "end_month": "10"
},
{
"start_date": "October 07 2017", "end_date": "October 08 2017",
"start_year": "2017", "end_year": "2017",
"start_yr": "17", "end_yr": "17",
"start_month": "10", "end_month": "10"
},
{
"start_date": "October 09 2017", "end_date": "October 10 2017",
"start_year": "2017", "end_year": "2017",
"start_yr": "17", "end_yr": "17",
"start_month": "10", "end_month": "10"
}
]
</code></pre>
</div>
</div>
<p class="flow-text">
Iterators by date are very often used to organize incremental data collection,
which allows you to save resources and perform the task faster.
</p>
<p class="flow-text">
Example of using date iterator in the digger:
</p>
<div class="row">
<div class="col s12">
<ul class="tabs excdark">
<li class="tab col s4"><a class="active" href="#config">Digger configuration</a></li>
<li class="tab col s4"><a href="#log">Execution log</a></li>
</ul>
</div>
<div id="config" class="col s12">
<pre class="language-yaml">
<code class="language-yaml">---
config:
debug: 2
agent: Firefox
iterator:
type: date
start: '2017-10-01'
period: 4
interval: 2
template: '%Y-%m-%d'
do:
- walk:
to: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?from=<%start_date%>&to=<%end_date%>
do:
</code></pre>
</div>
<div id="log" class="col s12">
<table id="datatable_logs" class="striped responsive-table debug-log" role="grid" aria-describedby="datatable_logs_info">
<thead>
<tr role="row">
<th class="sorting_desc" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Time: activate to sort column ascending" aria-sort="descending" width="11%">Time</th>
<th class="sorting" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Level: activate to sort column ascending" width="4%">Level</th>
<th class="word-wrapper sorting_disabled" rowspan="1" colspan="1" aria-label="Message">Message</th>
</tr>
</thead>
<tbody>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 14:23:41:335</td>
<td>info</td>
<td class=" word-wrapper">Scrape is done</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 14:23:41:321</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"/>
<title>Diggernaut | Meta-language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body></html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 14:23:41:166</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referers: Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?from=2017-10-01&to=2017-10-02
</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 14:23:41:158</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Referer: https://www.diggernaut.com/sandbox/meta-lang-object-en.html?from=2017-10-01&to=2017-10-02</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 14:23:41:150</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html?from=<span class="hlt2">2017-10-03</span>&to=<span class="hlt2">2017-10-04</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 14:23:41:138</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Page content: <!DOCTYPE html><html lang="en"><head>
<meta charset="UTF-8"/>
<title>Diggernaut | Meta-language | Object sample</title>
</head>
<body>
<h1>Title-1</h1>
<p>Lorem ipsum dolor sit amet.</p>
</body></html>
</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 14:23:40:185</td>
<td>info</td>
<td class=" word-wrapper">Retrieving page (GET): https://www.diggernaut.com/sandbox/meta-lang-object-en.html?from=<span class="hlt2">2017-10-01</span>&to=<span class="hlt2">2017-10-02</span></td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 14:23:40:178</td>
<td>info</td>
<td class=" word-wrapper">Starting scrape</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 14:23:40:166</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up default proxy</td>
</tr>
<tr role="row" class="even">
<td class="sorting_1">2017-10-23 14:23:40:153</td>
<td><span class="log-debug">debug</span></td>
<td class=" word-wrapper">Setting up surf</td>
</tr>
<tr role="row" class="odd">
<td class="sorting_1">2017-10-23 14:23:40:125</td>
<td>info</td>
<td class=" word-wrapper">Starting digger: meta-lang-iterator [1859]</td>
</tr>
</tbody>
</table>
</div>
</div>
<p class="flow-text">
Next we will learn more about <span class="hlt2">csv</span> iterators.
</p>
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<div class="pagination">
<a href="meta-language-iterators-csv-iterator.html" class="btn goto teal z-depth-2">Next</a>
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