# DateDiff

Calculates the difference between two date \ time \ datetime based on the date or time part requested

```wolfram
DateDiff("2021-01-01 22:00:00.000", "2022-01-06 11:00:00.000", DateValueOption.QUARTER) → 4
DateDiff(column1, column2, DateValueOption.DAY) → 7
```

#### Inputs

`DateAdd(dateTime, value, datePart)`

* `dateTime` - Date, time, or datetime value
* `value` - This is the number of units of time that you want to add
* `datePart` - This indicates the units of time that you want to add, ex. DateValueOption.DAY