以下内容适用于具有小数毫秒的DateTime,并且还保留Kind属性(Local,Utc或Undefined)。
DateTime dateTime = ... anything ...
dateTime = new DateTime(
dateTime.Ticks - (dateTime.Ticks % TimeSpan.TicksPerSecond),
dateTime.Kind
);
或更短或更短:
dateTime = dateTime.AddTicks( - (dateTime.Ticks % TimeSpan.TicksPerSecond));
可以将其概括为扩展方法:
public static DateTime Truncate(this DateTime dateTime, TimeSpan timeSpan)
{
if (timeSpan == TimeSpan.Zero) return dateTime; // Or Could throw an ArgumentException
if (dateTime == DateTime.MinValue || dateTime == DateTime.MaxValue) return dateTime; // do not modify "guard" values
return dateTime.AddTicks(-(dateTime.Ticks % timeSpan.Ticks));
}
其用法如下:
dateTime = dateTime.Truncate(TimeSpan.FromMilliseconds(1)); // Truncate to whole ms
dateTime = dateTime.Truncate(TimeSpan.FromSeconds(1)); // Truncate to whole second
dateTime = dateTime.Truncate(TimeSpan.FromMinutes(1)); // Truncate to whole minute
...