# WEEKNUM

## Content

This function returns a number that indicates the week of the year numerically.

## Syntax

`WEEKNUM( date, weektype )`

## Arguments

This function has these arguments:

| Argument | Description |  |
| -------- | ----------- | --- |
| *date* | Date for which you want to determine the number of weeks |  |
| *weektype* | Type of week determined by on which day the week starts |  |
|  | Value | Number returned |
|  | 1 (assumed if omitted) | Week starts on a Sunday |
|  | 2 | Week starts on a Monday |

Specify the date argument as a number (as in 37806.5) a string (as in "7/4/2003 12:00"), or a DateTime object, as in DATE(2003,7,4). For more details on the date inputs, refer to [Date and Time Functions](/spreadjs/docs/v16/formulareference/formulaoverview/functionsformula/dateandtime).

## Data Types

Accepts numeric, string, DateTime object, or TimeSpan object data. Returns numeric data.

## Examples

`WEEKNUM(A2)`

`WEEKNUM(R2C1,2)`

`WEEKNUM(23,1)` gives the result 4.