startofweek()

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Applies to: ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel

Returns the start of the week containing the date, shifted by an offset, if provided.

Start of the week is considered to be a Sunday.

Syntax

startofweek(date [, offset ])

Learn more about syntax conventions.

Parameters

Returns

A datetime representing the start of the week for the given date value, with the offset, if specified.

Examples

range offset from -1 to 1 step 1
| project weekStart = startofweek(datetime(2017-01-01 10:10:17), offset) 

Output

The following example returns the start of the week as Monday for the specified date.

let startofweekFromMonday = (dateArg: datetime) {
    datetime_add('day', 1, startofweek(datetime_add('day', -1, dateArg)))
};
let data=datatable(Date: datetime, day: string)
[
datetime(2025, 6, 14), "Saturday",
datetime(2025, 6, 15), "Sunday",
datetime(2025, 6, 16), "Monday",
datetime(2025, 6, 17), "Tuesday"
];
data 
| extend MondayWeek=startofweekFromMonday(Date)

Output

Related content

• dayofweek function
• endofweek function
• week_of_year function
• ago function
• bin function