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# `std.datetime.interval.NegInfInterval.shift` - multiple declarations

## Function NegInfInterval.shift

Shifts the `end` of this interval forward or backwards in time by the given duration (a positive duration shifts the interval forward; a negative duration shifts it backward). Effectively, it does `end += duration`.

``` void shift(D) (   D duration ) pure nothrow if (__traits(compiles, end + duration)); ```

### Parameters

NameDescription
duration The duration to shift the interval by.

### Example

``````auto interval1 = NegInfInterval!Date(Date(2012, 4, 5));
auto interval2 = NegInfInterval!Date(Date(2012, 4, 5));

interval1.shift(dur!"days"(50));
assert(interval1 == NegInfInterval!Date(Date(2012, 5, 25)));

interval2.shift(dur!"days"(-50));
assert(interval2 == NegInfInterval!Date( Date(2012, 2, 15)));``````

## Function NegInfInterval.shift

Shifts the `end` of this interval forward or backwards in time by the given number of years and/or months (a positive number of years and months shifts the interval forward; a negative number shifts it backward). It adds the years the given years and months to end. It effectively calls `add!"years"()` and then `add!"months"()` on end with the given number of years and months.

``` void shift(T) (   T years,   T months = 0,   AllowDayOverflow allowOverflow = AllowDayOverflow.yes ) if (isIntegral!T); ```

### Parameters

NameDescription
years The number of years to shift the interval by.
months The number of months to shift the interval by.
allowOverflow Whether the days should be allowed to overflow on `end`, causing its month to increment.

### Throws

`DateTimeException` if empty is true or if the resulting interval would be invalid.

### Example

``````auto interval1 = NegInfInterval!Date(Date(2012, 3, 1));
auto interval2 = NegInfInterval!Date(Date(2012, 3, 1));

interval1.shift(2);
assert(interval1 == NegInfInterval!Date(Date(2014, 3, 1)));

interval2.shift(-2);
assert(interval2 == NegInfInterval!Date(Date(2010, 3, 1)));``````