toStartOfMonth
Rounds down a date or date with time to the first day of the month. Returns the date.
Syntax
toStartOfMonth(expr)
Arguments
| Arguments | Description | 
|---|---|
| expr | date16/date32/datetime | 
Return Type
Datetime object, returns date in “YYYY-MM-DD” format.
Examples
mysql> select toStartOfMonth(toDate(18869));
+-------------------------------+
| toStartOfMonth(toDate(18869)) |
+-------------------------------+
| 2021-08-01                    |
+-------------------------------+
mysql> select toStartOfMonth(toDateTime(1630812366));
+----------------------------------------+
| toStartOfMonth(toDateTime(1630812366)) |
+----------------------------------------+
| 2021-09-01                             |
+----------------------------------------+