Fix freshness assertion: test timezone

Author: Hugo Rialan

definitions/example.js

@@ -47,10 +47,7 @@ const commonAssertionsResult = commonAssertions({
         "timeZone": "America/Los_Angeles"
       },
       "second_table": {
-        // If timeUnit is not DAY, WEEK, MONTH, QUARTER, or YEAR, dateColumn should be a TIMESTAMP.
-        // Check here for valid Date time units: https://cloud.google.com/bigquery/docs/reference/standard-sql/date_functions#date_diff
-        // Check here for valid Timestamp time units: https://cloud.google.com/bigquery/docs/reference/standard-sql/timestamp_functions#timestamp_diff
-        "dateColumn": "TIMESTAMP(updated_date)",
+        "dateColumn": "updated_date",
         "timeUnit": "HOUR",
         "delayCondition": 3,
         "timeZone": "-08"

includes/data_freshness_assertions.js

@@ -40,7 +40,7 @@ const createDataFreshnessAssertion = (globalParams, schemaName, tableName, filte
                         SELECT
                           ${["DAY", "WEEK", "MONTH", "QUARTER", "YEAR"].includes(timeUnit)
                               ? `DATE_DIFF(CURRENT_DATE("${timeZone}"), MAX(${dateColumn}), ${timeUnit})`
-                              : `TIMESTAMP_DIFF(CURRENT_TIMESTAMP(), MAX(${dateColumn}), ${timeUnit})`} AS delay
+                              : `TIMESTAMP_DIFF(CURRENT_TIMESTAMP(), TIMESTAMP(MAX(${dateColumn}),"${timeZone}"), ${timeUnit})`} AS delay
                         FROM
                             filtering
                     )