How Can I Round Up a DateTime Object to the Nearest X Minutes?

Rounding Up Time to the Nearest X Minutes

When dealing with timestamps, it often becomes necessary to round time values to specific intervals. For instance, you may need to round a time to the nearest 15 minutes, especially when working with scheduling or appointment systems.

To address this need, there exists a versatile function that allows for the straightforward rounding up of a DateTime object to the nearest X minutes.

Implementation

The following code snippet showcases the aforementioned function:

DateTime RoundUp(DateTime dt, TimeSpan d)
{
    return new DateTime((dt.Ticks + d.Ticks - 1) / d.Ticks * d.Ticks, dt.Kind);
}

Usage

To employ this function, simply provide the DateTime you wish to round and the interval (TimeSpan) to round to. For example, to round up to the nearest 15 minutes:

var dt1 = RoundUp(DateTime.Parse("2011-08-11 16:59"), TimeSpan.FromMinutes(15));
// dt1 == {11/08/2011 17:00:00}

This will round the time to the nearest 15-minute interval, resulting in 17:00 in the example above.

Additional Examples

• Rounding up to the nearest 30 minutes:

var dt2 = RoundUp(DateTime.Parse("2011-08-11 17:11"), TimeSpan.FromMinutes(30));
// dt2 == {11/08/2011 17:30:00}

• Rounding up to the nearest 60 minutes (1 hour):

var dt3 = RoundUp(DateTime.Parse("2011-08-11 18:05"), TimeSpan.FromMinutes(60));
// dt3 == {11/08/2011 19:00:00}

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