# subtract method

DateTime subtract (Duration duration)

Returns a new DateTime instance with `duration` subtracted from this.

    DateTime today = new DateTime.now();
    DateTime fiftyDaysAgo = today.subtract(new Duration(days: 50));

Notice that the duration being subtracted is actually 50 * 24 * 60 * 60 seconds. If the resulting `DateTime` has a different daylight saving offset than `this`, then the result won't have the same time-of-day as `this`, and may not even hit the calendar date 50 days earlier.

Be careful when working with dates in local time.

## Implementation

    external DateTime subtract(Duration duration);