IBM Mainframe Forum

I am looking for a algoritm to convert GMT/UTC to local time (Europe: during winter +1, during summer +2).
Anything out there?

Assembler macro CONVTOD will apply your offset (+/- hours) to a UTC timestamp.

Is CONVTOD supplied with z/OS?

Yes, it's supplied with z/OS. Read about it the MVS Assembler Macros Reference manual. You could check the LE Callable Services as there may be a function there, too.

Actually, I'm not sure Mr. Dennis is correct. CONVTOD translates binary TOD clock values to a more digestible format, but I do not believe it applies time zone and leap second corrections to the binary TOD clock values. Your program must do that using the leap second and timezone correction constants in the secondary CVT. By the way, using CVTTZ does not work correctly: it does not have leap second correction built into it, and you should not use it.

Bill Dennis wrote:You could check the LE Callable Services as there may be a function there, too.

It is CEEGMTO.