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Date and Time
Functions		Platforms

The functions in this library define a set of operations on dates and times. They are built around a standard normalized form for the date/time, a 19-character string in "YYYYMMDDhhmmss+ZHZM" format where:

• "YYYY" is the four-digit year
• "MM" is the two-digit month number
• "DD" is the two-digit day within the month
• "hh" is the two-digit hour within the day
• "mm" is the two-digit minute within the hour
• "ss" is the two-digit second within the minute
• "+ZH" is the (always) signed two-digit whole number of hours that the given time is ahead of Universal Time
• "ZM" is the two-digit number of minutes that the given time is ahead of Universal Time in excess of the number of such hours (with the same sign assumed as for "+ZH")

The response to erroneous argument values in these functions is to return a conventional value: for "stream" valued results this is always the string "???", and for "counter" valued results this is 0 (zero) for differences or 1 (one) for counts.

To use this library in a program, you must include the following code near the top of your program: