Benjamin Valentin bad385ab7c cpu/efm32: RTC Series 0: use RTC helper functions
By using the RTC helper functions instead of POSIX mktime()/gmtime()
we can not only extend the RTC range beyond Y2038.

For tests/periph_rtc:

before:

   text	   data	    bss	    dec	    hex	filename
  28028	    248	   2472	  30748	   781c stk3700/tests_periph_rtc.elf

after:

   text	   data	    bss	    dec	    hex	filename
  19400	    144	   2424	  21968	   55d0 stk3700/tests_periph_rtc.elf

fixes #13277
2020-11-09 17:57:57 +01:00
..
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