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

How to round up a DateTime to the nearest X minutes with C

Rounding up a DateTime to the nearest specified number of minutes can be useful in a variety of scenarios. Here's a simple and efficient solution for this task:

1. Create a RoundUp Utility Function:

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

2. Usage:

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

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

3. Understanding the Code:

• The RoundUp function takes a DateTime (dt) and a TimeSpan (d) representing the rounding interval.
• The expression (dt.Ticks d.Ticks - 1) calculates the nearest tick value divisible by d.Ticks.
• The division and multiplication by d.Ticks ensures the result is rounded up to the specified interval.
• The new DateTime is created with the computed ticks and the same Kind (local/UTC) as the original DateTime.

Example Output:

• Input: 2011-08-11 16:59
• Result: 2011-08-11 17:00

Additional Notes:

• This approach rounds up to the nearest whole number of intervals, regardless of the time zone.
• To round down, replace (dt.Ticks d.Ticks - 1) with (dt.Ticks 1).

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