DateTime RoundUp(DateTime dt, TimeSpan d)
{
return new DateTime(((dt.Ticks + d.Ticks - 1) / d.Ticks) * d.Ticks);
}
var dt1 = RoundUp(DateTime.Parse("2011-08-11 16:59"), TimeSpan.FromMinutes(15));
// dt1 == {11/08/2011 17:00:00}
var dt2 = RoundUp(DateTime.Parse("2011-08-11 17:00"), TimeSpan.FromMinutes(15));
// dt2 == {11/08/2011 17:00:00}
var dt3 = RoundUp(DateTime.Parse("2011-08-11 17:01"), TimeSpan.FromMinutes(15));
// dt3 == {11/08/2011 17:15:00}
void Main()
{
var date1 = new DateTime(2011, 8, 11, 16, 59, 00);
date1.Round15().Dump();
var date2 = new DateTime(2011, 8, 11, 17, 00, 02);
date2.Round15().Dump();
var date3 = new DateTime(2011, 8, 11, 17, 01, 23);
date3.Round15().Dump();
var date4 = new DateTime(2011, 8, 11, 17, 00, 00);
date4.Round15().Dump();
}
public static class Extentions
{
public static DateTime Round15(this DateTime value)
{
var ticksIn15Mins = TimeSpan.FromMinutes(15).Ticks;
return (value.Ticks % ticksIn15Mins == 0) ? value : new DateTime((value.Ticks / ticksIn15Mins + 1) * ticksIn15Mins);
}
}
8/11/2011 5:00:00 PM
8/11/2011 5:15:00 PM
8/11/2011 5:15:00 PM
8/11/2011 5:00:00 PM
dt.AddSeconds(900 - (x.Minute * 60 + x.Second) % 900)
public static class DateTimeExtensions
{
public static DateTime Round( this DateTime value , TimeSpan unit )
{
return Round( value , unit , default(MidpointRounding) ) ;
}
public static DateTime Round( this DateTime value , TimeSpan unit , MidpointRounding style )
{
if ( unit <= TimeSpan.Zero ) throw new ArgumentOutOfRangeException("unit" , "value must be positive") ;
Decimal units = (decimal) value.Ticks / (decimal) unit.Ticks ;
Decimal roundedUnits = Math.Round( units , style ) ;
long roundedTicks = (long) roundedUnits * unit.Ticks ;
DateTime instance = new DateTime( roundedTicks ) ;
return instance ;
}
}