Introduction - If you have any usage issues, please Google them yourself
** This a set of math function 's that deal with time.* The functions accept 4-d igit time values and 4-digit time of day values.* Time values are interpreted as hours-minutes and are valid if all digits are numeric and* 9 or l ess. except the second-to-last digit must be five or les s.* Time of day values are valid if they conform t o clock normally accepted values of* 1:00 to 12 : 59 for a 12-hour clock or 00:00 to 23 : 59 for a 24-hour clock.