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WEEKNUM calculates the week number of the year for the internal date value as defined in ODF OpenFormula and compatible with other spreadsheet applications.
Supported are two week numbering systems:
| System | Description | 
|---|---|
| System 1 | The week containing January 1 is the first week of the year, and is numbered week 1. | 
| System 2 | The week containing the first Thursday of the year is the first week of the year, and is numbered week 1. That means that week number 1 of any year is the week that contains January 4th. ISO 8601 defines this system and that the week starts on Monday. | 
WEEKNUM(ཨང་; ཐབས་ལམ།)
ཨང་ འདི་ནང་འཁོད་གནད་སྡུད་ཨང་ཨིན།
Mode sets the start of the week and the week numbering system. This parameter is optional, if omitted the default value is 1.
| System | Mode | Day of the week | 
|---|---|---|
| System 1 | 1 | Sunday | 
| 2 | Monday | |
| 11 | Monday | |
| 12 | Tuesday | |
| 13 | Wednesday | |
| 14 | Thursday | |
| 15 | Friday | |
| 16 | Saturday | |
| 17 | Sunday | |
| System 2 | 21 | Monday (ISO 8601) | 
| 150 | (ISO 8601, for interoperability with Gnumeric) | 
=WEEKNUM(DATE(1995;1;1);1) returns 1
=WEEKNUM(DATE(1995;1;1);2) returns 1. Using System 1, the week containing January 1 is the first week of the year.
=WEEKNUM(DATE(1995;1;1);21) returns 52. Week 1 starts on Monday, 1995-01-02.
=WEEKNUM(DATE(1999;1;1);21) returns 53. Week 1 starts on Monday, 1999-01-04.