isvalid


Purpose
Check whether a date, time or datetime is valid.
Synopsis
function isvalid(d:date):boolean
function isvalid(t:time):boolean
function isvalid(dt:datetime):boolean
Arguments
A date object
A time object
dt 
A datetime object
Return value
True if the argument is valid.
Further information
A date is valid if its month number is in the range 1-12 and its day number is in the range 1-31 and is compatible with its month number (for instance 2006-2-29 is not a valid date). A time is valid if it is positive and smaller than an entire day. A datetime is valid if both its date part and its time part are valid.
Module
mmsystem


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