parse_iso8601_date

Extracts date parts from value, and sets gdate's contents

Accepted date format is "YYYY-MM-DD" (more or less than 4 digits for years and less than 2 digits for month and day are accepted). Years must be in the 1-65535 range, a limitation imposed by Date.

Parameters:

gdate	a pointer to a Date structure which will be filled
value	a string

Returns:

true if value has been sucessfuly parsed as a valid date (see valid).