TO_START_OF_MONTH

Rounds down a date or date with time (timestamp/datetime) to the first day of the month. Returns the date.

Syntax

TO_START_OF_MONTH(<expr>)

Arguments

Arguments	Description
<expr>	date/timestamp

Return Type

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

Examples

SELECT
  to_start_of_month('2023-11-12 09:38:18.165575')

┌─────────────────────────────────────────────────┐
│ to_start_of_month('2023-11-12 09:38:18.165575') │
│                       Date                      │
├─────────────────────────────────────────────────┤
│ 2023-11-01                                      │
└─────────────────────────────────────────────────┘