Compiler/TM4C1290NCPDT: mktime() leapyear is going wrong?

Nigel Meijer1

Part Number: TM4C1290NCPDT

Tool/software: TI C/C++ Compiler

Hi,

I have an issue with the mktime function where 2 dates return the same value.

tm struct DD-MM-YY	HH:MM:SS	output of mktime
29/Feb/2020	00:00:00	1582934400
01/Mar/2020	00:00:00	1582934400

I'm using a TM4C1290NCPDT with compiler ti-cgt-arm_18.1.3.LTS

Am I missing something here?

If i run the same dates through mktime in e.g. onlinegdb i get the following results which are the expected values

29-feb = 1582934400
1-mar = 1583020800

Am I missing something here?

over 5 years ago

0 George Mock over 5 years ago

TI__Guru**** 251220 points

I'm not certain, but I think you have the same issue discussed in this forum thread. In that thread, the fix to the problem is to add the build option -D__TI_TIME_USES_64.

Please let me know if this suggestion resolves the problem.

Thanks and regards,

-George

0 Nigel Meijer1 over 5 years ago in reply to George Mock

Prodigy 30 points

Thank you, this indeed fixes the problem partly,

1-mar 00:00:00 now returns 1583042400 which translates to 1-mar 06:00:00

0 George Mock over 5 years ago in reply to Nigel Meijer1

TI__Guru**** 251220 points

I apologize for the delay.

The function mktime assumes the time zone is Central Time in the United States. To change it to UTC add this line of code ...

_tz.timezone = 0;

For more details, please see this forum thread.

Thanks and regards,

-George

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Compiler/TM4C1290NCPDT: mktime() leapyear is going wrong?