你当前正在访问 Microsoft Azure Global Edition 技术文档网站。 如果需要访问由世纪互联运营的 Microsoft Azure 中国技术文档网站，请访问 https://docs.azure.cn。
startofday()
Applies to: ✅ Microsoft Fabric ✅ Azure Data Explorer ✅ Azure Monitor ✅ Microsoft Sentinel
Returns the start of the day containing the date, shifted by an offset, if provided.
Syntax
startofday(date [, offset ])
Learn more about syntax conventions.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
| date | datetime |
✔️ | The date for which to find the start. |
| offset | int |
The number of days to offset from the input date. The default is 0. |
Returns
A datetime representing the start of the day for the given date value, with the offset, if specified.
Example
range offset from -1 to 1 step 1
| project dayStart = startofday(datetime(2017-01-01 10:10:17), offset)
Output
| dayStart |
|---|
| 2016-12-31 00:00:00.0000000 |
| 2017-01-01 00:00:00.0000000 |
| 2017-01-02 00:00:00.0000000 |