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WEEKNUMBER
Returns the week number within the year of a given date or dateTime value. The week number is returned as an integer in the range 1 - 53. Week 1 for a year is the earliest seven day period starting at Monday that contains at least 4days from that year. This definition reflects the ISO 8601 Week dates definition.
For example, January 1, 2015 was a Thursday. Therefore week 1 of 2015 starts on December 29, 2014, and ends on January 4, 2015.
Syntax
WEEKNUMBER ( date | dateTime )
Inputs
- date or dateTime - The date or dateTime value of which the week number must be returned.
Return type
- integer
Examples
| Expression | Result | Type |
|---|---|---|
| WEEKNUMBER ( DATE ( 2015 , 01 , 01 ) ) | 1 | Integer |
| WEEKNUMBER ( DATETIME ( 2014 , 12 , 28 , 0 , 0 , 0 ) ) | 1 | Integer |
| WEEKNUMBER ( DATE ( 2015 , 12 , 28 ) ) | 53 | Integer |
| WEEKNUMBER ( DATE ( 2016 , 01 , 02 ) ) | 53 | Integer |
| WEEKNUMBER ( DATETIME ( 2016 , 01 , 04 , 0 , 0 , 0 ) ) | 1 | Integer |
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