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| using System;
public static class Program
{
/// <summary>
/// Rounds datetime up, down or to nearest minutes and all smaller units to zero
/// </summary>
/// <param name="dt">ignore, implicitly passed</param>
/// <param name="rndmin">mins to round to</param>
/// <param name="directn">Up,Down,Nearest</param>
/// <returns>rounded datetime with all smaller units than mins rounded off</returns>
public static DateTime RoundToNearestMinuteProper(this DateTime dt, int rndmin, RoundingDirection directn)
{
if (rndmin == 0) //can be > 60 mins
return dt;
TimeSpan d = TimeSpan.FromMinutes(rndmin); //this can be passed as a parameter, or use any timespan unit FromDays, FromHours, etc.
long delta = 0;
Int64 modTicks = dt.Ticks % d.Ticks;
switch (directn)
{
case RoundingDirection.Up:
delta = (modTicks != 0) ? d.Ticks - modTicks : 0;
break;
case RoundingDirection.Down:
delta = -modTicks;
break;
case RoundingDirection.Nearest:
{
bool roundUp = modTicks > (d.Ticks / 2);
var offset = roundUp ? d.Ticks : 0;
delta = offset - modTicks;
break;
}
}
return new DateTime(dt.Ticks + delta, dt.Kind);
}
public enum RoundingDirection
{
Up,
Down,
Nearest
}
public static void Main()
{
//var dt = new DateTime(2001, 1, 1, 0, 0, 0, 000);
//var dt = new DateTime(2018, 08, 03, 10, 7, 30, 000); //8/3/2018 10:00:00 AM Nearest, re 15/2 = 7.5 mins or 7 mins and 30 secs
var dt = new DateTime(2018, 08, 03, 10, 7, 31, 000); //8/3/2018 10:15:00 AM Nearest
Console.WriteLine(dt.RoundToNearestMinuteProper(15, RoundingDirection.Up));
Console.WriteLine(dt.RoundToNearestMinuteProper(15, RoundingDirection.Down));
Console.WriteLine(dt.RoundToNearestMinuteProper(15, RoundingDirection.Nearest));
}
}
|