Thomas Chamberlain

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9 years, 9 months ago.

Question regarding __DATE__ and __TIME__

These are simple questions but I could not find them addressed in the forum already.

__DATE__ and __TIME__ appear to return GMT (side effect of a web-hosted compiler).  I have two questions:

1.  Is it possible to set a compiler flag to indicate the time zone that will affect the strings that __DATE__ and __TIME__ return?
2.  Do __DATE__ and __TIME__ understand daylight saving time?  I could wait until spring to find out, I suppose :)

Thanks.

2 Answers

Erik -
9 years, 9 months ago.

Since it isn't possible to set flags in the online compiler, that for sure is no option. And GMT does not have daylight savings.

Martin Kojtal
9 years, 9 months ago.

As stated https://gcc.gnu.org/onlinedocs/cpp/Standard-Predefined-Macros.html, ARMCC has some similar regarding this two macros. Both are computer dependent, so now it can be GMT , in the next compilation another time zone.

What's your use of them?

Didn't quite understand your answer, did you mean the next compilation of the web-based compiler, or the next compilation of my code?

I'm using them to create a version string that gets written to an EEPROM I have on a custom shield board mounted to a FRDM-KL25Z.

posted by Thomas Chamberlain 13 Feb 2015