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

Round Up DateTime to the Nearest X Minutes

Question:

How can you round up a DateTime object to the nearest multiple of a specified number of minutes?

Use Case:

This technique is useful in scenarios where you need to snap a time to a consistent interval, such as scheduling appointments or aligning data to specific timeframes.

Solution:

The following C# function, RoundUp, achieves this rounding operation:

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

Example:

To round up a DateTime value to the nearest 15 minutes, use the following code:

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

This will result in dt1 being set to {11/08/2011 17:00:00}. Similarly, if the original value is 2011-08-11 17:01, dt1 will be set to {11/08/2011 17:15:00}.

By adjusting the TimeSpan.FromMinutes(15) argument, you can specify any desired rounding interval. This method provides a convenient way to round up times to specific intervals, enabling you to perform precise time calculations in your applications.

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