How Can I Round Up a DateTime to the Nearest Time Increment in C#?

Round Up DateTime to Nearest Time Increment

In many programming scenarios, rounding up a DateTime value to the nearest specific time increment becomes necessary. For instance, a common requirement is to round up to the nearest 15 minutes to align with business schedule constraints.

To address this need, a simple and effective function called RoundUp can be utilized. It takes two parameters: a DateTime value and a TimeSpan representing the desired increment.

Function Implementation:

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

Usage:

The following code snippet demonstrates how to apply the RoundUp function to various DateTime values with an increment of 15 minutes:

// Round up to nearest 15-minute increment
var dt1 = RoundUp(DateTime.Parse("2011-08-11 16:59"), TimeSpan.FromMinutes(15));
// Output: {11/08/2011 17:00:00}

var dt2 = RoundUp(DateTime.Parse("2011-08-11 17:00"), TimeSpan.FromMinutes(15));
// Output: {11/08/2011 17:00:00}

var dt3 = RoundUp(DateTime.Parse("2011-08-11 17:01"), TimeSpan.FromMinutes(15));
// Output: {11/08/2011 17:15:00}

In this example:

• dt1 with an initial value of "16:59" is rounded up to "17:00".
• dt2 with an initial value of "17:00" remains unchanged since it already falls on a 15-minute boundary.
• dt3 with an initial value of "17:01" is rounded up to "17:15".

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