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Last day of the month

Description

In some SQL dialects there is a LAST_DAY function, but there isn’t one in BigQuery. We can achieve the same by taking the day before the first day of the following month.

  1. DATE_ADD(<date>, INTERVAL 1 MONTH) sets the reference date to the following month.
  2. DATE_TRUNC(<date>, MONTH) gets the first day of that month.
  3. DATE_SUB(<date>, INTERVAL 1 DAY) gets the day before. <date>-1 can be used as well.

Example: Last day of the current month (local time)

SELECT
DATE_TRUNC(DATE_ADD(CURRENT_DATE('Europe/Madrid'), INTERVAL 1 MONTH), MONTH) - 1

If no time zone is specified as an argument to CURRENT_DATE, the default time zone, UTC, is used.