/// <summary>
/// Rounds the specified date time down to the specified units.
/// </summary>
/// <example>
/// (2014-02-12 10:33:24 AM, DateTimeUnits.Minute) => 2014-02-12 10:33:00 AM
/// </example>
public static DateTime Floor(this DateTime value, DateTimeUnits units)
{
switch (units)
{
case DateTimeUnits.Seconds:
return(new DateTime(value.Year, value.Month, value.Day, value.Hour, value.Minute, value.Second, value.Kind));
case DateTimeUnits.Minutes:
return(new DateTime(value.Year, value.Month, value.Day, value.Hour, value.Minute, 0, value.Kind));
case DateTimeUnits.Hours:
return(new DateTime(value.Year, value.Month, value.Day, value.Hour, 0, 0, value.Kind));
case DateTimeUnits.Days:
return(new DateTime(value.Year, value.Month, value.Day, 0, 0, 0, value.Kind));
case DateTimeUnits.Weeks:
return(new DateTime(value.Year, value.Month, value.Day, 0, 0, 0, value.Kind).AddDays(1 - (int)value.DayOfWeek));
case DateTimeUnits.Months:
return(new DateTime(value.Year, value.Month, 1, 0, 0, 0, value.Kind));
case DateTimeUnits.Years:
return(new DateTime(value.Year, 1, 1, 0, 0, 0, value.Kind));
default:
throw new ArgumentOutOfRangeException("units");
}
}
private static DateTimeRange ParseShort(Match match)
{
var quantityStr = match.Groups["magnitude"].Value;
var resolutionStr = match.Groups["units"].Value;
DateTimeUnits units;
switch (resolutionStr.ToLowerInvariant())
{
case "s":
units = DateTimeUnits.Seconds;
break;
case "m":
units = DateTimeUnits.Minutes;
break;
case "h":
units = DateTimeUnits.Hours;
break;
case "d":
units = DateTimeUnits.Days;
break;
case "w":
units = DateTimeUnits.Weeks;
break;
case "n":
units = DateTimeUnits.Months;
break;
case "y":
units = DateTimeUnits.Years;
break;
default:
throw new FormatException("'" + resolutionStr + "' is not a valid units. specify one of [Seconds, Minutes, Hours, Days, Months, Years].");
}
var quantity = double.Parse(quantityStr);
return(new DateTimeRange(quantity, units));
}
public DateTimeRange(double magnitude, DateTimeUnits units)
: this()
{
this.magnitude = magnitude;
this.units = units;
}
