DATEPART

Syntax

DATEPART( datetime, unit [ , firstday ] )

Description

Returns a part of the date as an integer.

Depending on the argument, unit returns the following values:

  • "year" — the year number (see YEAR);
  • "quarter" — the number of the quarter (from 1 to 4) of the year (see QUARTER);
  • "month" — the number of the month in the year (see MONTH);
  • "week" — the number of the week in the year according to ISO 8601 (see WEEK);
  • "dayofweek", "dow" — the number of the day of the week (see DAYOFWEEK);
  • "day" — the number of the day in the month (see DAY);
  • "hour" — the number of the hour in the day (see HOUR);
  • "minute" — the number of the minute in the hour (see MINUTE);
  • "second" — the number of the second in the minute (see SECOND).

If you select "dayofweek", you can use the additional parameter firstday to specify the first day of the week (Monday by default). Learn more about this parameter in the DAYOFWEEK function description.

Argument types:

  • datetime — Date | Datetime
  • unit — String
  • firstday — String

Return type: Integer

Note

Only constant values are accepted for the arguments (firstday).

Examples

Example with date

Formulas:

  • Date: [Date] ;
  • Year: DATEPART([Date], "year") ;
  • Month: DATEPART([Date], "month") ;
  • Day: DATEPART([Date], "day") ;
  • DayOfWeek: DATEPART([Date], "dayofweek") ;
  • DOW: DATEPART([Date], "dow") .
Date Year Month Day DayOfWeek DOW
2014-10-06 2014 10 6 1 1
2014-10-07 2014 10 7 2 2
2017-03-08 2017 3 8 3 3
2024-02-12 2024 2 12 1 1
Example with custom first day of the week

Formulas:

  • Date: [Date] ;
  • DOW: DATEPART([Date], "dow") ;
  • DOW sun: DATEPART([Date], "dow", "sun") ;
  • DOW Monday: DATEPART([Date], "dow", "Monday") ;
  • DOW wed: DATEPART([Date], "dow", "wed") .
Date DOW DOW sun DOW Monday DOW wed
2014-10-06 1 2 1 6
2014-10-07 2 3 2 7
2017-03-08 3 4 3 1
2024-02-12 1 2 1 6
Example with date and time

Formulas:

  • DateTime: [DateTime] ;
  • Year: DATEPART([DateTime], "year") ;
  • Month: DATEPART([DateTime], "month") ;
  • Day: DATEPART([DateTime], "day") ;
  • Hour: DATEPART([DateTime], "hour") ;
  • Minute: DATEPART([DateTime], "minute") ;
  • Second: DATEPART([DateTime], "second") .
DateTime Year Month Day Hour Minute Second
2014-10-06T07:45:12 2014 10 6 7 45 12
2014-10-07T11:10:15 2014 10 7 11 10 15
2017-03-08T23:59:59 2017 3 8 23 59 59
2024-02-12T07:40:33 2024 2 12 7 40 33

Data source support

ClickHouse 19.13, Microsoft SQL Server 2017 (14.0), MySQL 5.6, PostgreSQL 9.3.

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