How to use DateTime to round down the time by n minutes depending on the current time in the pc?-CodePudding

DateTime RoundDown(DateTime date, TimeSpan interval)
        {
            return new DateTime(date.Ticks / interval.Ticks *
                interval.Ticks);
        }

using it

DateTime currentTime = RoundDown(DateTime.Now, TimeSpan.FromMinutes(-5));

but i want to add an option that it will check for the current pc time and if for example the time is 22:51 then round down to 22:50 meaning round down by 1.

so something like if i will call the method RoundDown like : RoundDown(); it will automatic check if to round down by 1 depending on the pc time.

if i will call it by : RoundDown(DateTime.Now, TimeSpan.FromMinutes(-5)); then it will round down by 5 or any number i give it.

CodePudding user response：

That would just be:

  public static void Main (string[] args) {
    Console.WriteLine(RoundDown(DateTime.Now, 5));
  }

  public static DateTime RoundDown(DateTime dt, int NearestMinuteInterval)
  {
    return new DateTime(dt.Year, dt.Month, dt.Day, dt.Hour, dt.Minute / NearestMinuteInterval * NearestMinuteInterval, 0);
  }