valid

bool valid(string units)(int  value) if (units ==  "months" ||
     units ==  "hours" ||
     units ==  "minutes" ||
     units ==  "seconds")

@safe pure nothrow @nogc

Returns whether the given value is valid for the given unit type when in a time point. Naturally, a duration is not held to a particular range, but the values in a time point are (e.g. a month must be in the range of 1 - 12 inclusive).

Parameters

`units`	The units of time to validate.
`value`	The number to validate.

fnbool valid(string units)(int year, int month, int day) if (units == "days") @safe pure nothrow @nogc

Returns whether the given day is valid for the given year and month.

Parameters

`units`	The units of time to validate.
`year`	The year of the day to validate.
`month`	The month of the day to validate (January is 1).
`day`	The day to validate.