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toStartOfISOYear

Returns the first day of the ISO year for a date or a date with time.

Syntax​

toStartOfISOYear(expr)

Return Type​

Datetime object, returns date in “YYYY-MM-DD” format.

Examples​

mysql> select toStartOfISOYear(toDate(18869));
+---------------------------------+
| toStartOfISOYear(toDate(18869)) |
+---------------------------------+
| 2021-01-04                      |
+---------------------------------+

mysql> select toStartOfISOYear(toDateTime(1630812366));
+------------------------------------------+
| toStartOfISOYear(toDateTime(1630812366)) |
+------------------------------------------+
| 2021-01-04                               |
+------------------------------------------+