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Asked: 2026-05-11T15:55:22+00:00

I want to round a DateTime to the nearest 5 seconds. This is the

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I want to round a DateTime to the nearest 5 seconds. This is the way I’m currently doing it but I was wondering if there was a better or more concise way?

DateTime now = DateTime.Now; int second = 0;  // round to nearest 5 second mark if (now.Second % 5 > 2.5) {     // round up     second = now.Second + (5 - (now.Second % 5)); } else {     // round down     second = now.Second - (now.Second % 5); }  DateTime rounded = new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, second);

Please note that I’ve found these two previous questions, however they truncate rather than round the time.

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  1. The Ticks count of a DateTime represents 100-nanosecond intervals, so you can round to the nearest 5 seconds by rounding to the nearest 50000000-tick interval like this:

      DateTime now = DateTime.Now;   DateTime rounded = new DateTime(((now.Ticks + 25000000) / 50000000) * 50000000);

    That’s more concise, but not necessarily better. It depends on whether you prefer brevity and speed over code clarity. Yours is arguably easier to understand.

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