/// <summary>
/// Returns the Largest DateTime less then or equal to the specified DateTime object to a specified Precision Value at a specified Precision Level
/// </summary>
/// <param name="datetime">A DateTime object </param>
/// <param name="value">A long precision value which makes a multiple to the precision level</param>
/// <param name="precisionLevel">One of DateTimePrecisionLevel values</param>
/// <exception cref="ArgumentException"></exception>
/// <returns>A new DateTime object Floored or reduced to Specified Precision Levels</returns>
public static DateTime Floor(this DateTime datetime, long value, DateTimePrecisionLevel precisionLevel)
{
if (value < 1)
{
throw new ArgumentException("value can not be less then 1", "value");
}
const long milliSeconds = 10000,
seconds = milliSeconds * 1000,
minutes = seconds * 60,
hours = minutes * 60,
days = hours * 24;
long precisionvalue;
switch (precisionLevel)
{
case DateTimePrecisionLevel.MilliSeconds:
{
precisionvalue = milliSeconds;
break;
}
case DateTimePrecisionLevel.Seconds:
{
precisionvalue = seconds;
break;
}
case DateTimePrecisionLevel.Minutes:
{
precisionvalue = minutes;
break;
}
case DateTimePrecisionLevel.Hours:
{
precisionvalue = hours;
break;
}
case DateTimePrecisionLevel.Days:
{
precisionvalue = days;
break;
}
default:
{
throw new ArgumentException(
String.Format(
"Precission Level can only be one of DateTimePrecisionLevels. {0} is not a valid value for this argument",
(int)precisionLevel), "precisionLevel");
}
}
return(new DateTime(datetime.Ticks - (datetime.Ticks % (precisionvalue * value)), datetime.Kind));
}
/// <summary>
/// Returns the Largest DateTime less then or equal to the specified DateTime object at a specified Precision Level
/// </summary>
/// <param name="datetime">A DateTime object</param>
/// <param name="precisionLevel">One of DateTimePrecisionLevel values</param>
/// <returns>A new DateTime object Floored or reduced to Specified Precision Levels</returns>
public static DateTime Floor(this DateTime datetime, DateTimePrecisionLevel precisionLevel)
{
const long milliSeconds = 10000,
seconds = milliSeconds*1000,
minutes = seconds*60,
hours = minutes*60,
days = hours * 24;
long precisionvalue;
switch (precisionLevel)
{
case DateTimePrecisionLevel.MilliSeconds:
{
precisionvalue = milliSeconds;
break;
}
case DateTimePrecisionLevel.Seconds:
{
precisionvalue = seconds;
break;
}
case DateTimePrecisionLevel.Minutes:
{
precisionvalue = minutes;
break;
}
case DateTimePrecisionLevel.Hours:
{
precisionvalue = hours;
break;
}
case DateTimePrecisionLevel.Days:
{
precisionvalue = days;
break;
}
default:
{
throw new ArgumentException(
String.Format(
"Precission Level can only be one of DateTimePrecisionLevel Values. {0} is not a valid value for this argument",
(int) precisionLevel), "precisionLevel");
}
}
return new DateTime(datetime.Ticks - (datetime.Ticks % precisionvalue), datetime.Kind);
}
