definition:
The DATEADD () function plus the date specified in the time interval.
※ specified time interval can be negative
grammar:
DATEADD(datepart,number,date)
parameter:
① the datepart of a parameter can be the following values:
| datepart | abbreviation |
|---|---|
| year | yy, yyyy |
| Quarter | qq, q |
| month | mm, m |
| On the day | house, the |
| day | dd, d |
| week | wk, ww |
| week | dw, w |
| hour | hh |
| minute | me n |
| second | ss, s |
| millisecond | ms |
| subtle | mcs |
| Ns | ns |
② Number The is the time interval you want to add. Can be positive, it can be negative.
③ DATE parameter is valid date expression.
Example:
