How to know on RTC date after a specific number (stm32f401)

miracaydogan · ‎2016-10-31

Posted on October 31, 2016 at 16:27

For example : My date is 31.10.2016 . After 120 days later, what is my new date ?

Is it possible to know it on internal RTC module or maybe calculation?? (STM32F401)

#rtc

Tesla DeLorean · ‎2016-10-31

Posted on October 31, 2016 at 16:44

You'd need to compute based on established day, month, year relationships.

The RTC hardware is a relatively simple implementation, but doesn't provide a method to do math on the settings.

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jpeacock23 · ‎2016-10-31

Posted on November 01, 2016 at 03:03

There are several ways to perform date arithmetic. Search on Julian date for examples of handling date only math.

Another alternative is to use the C runtime functions in time.h. Convert date and time to a 32-bit seconds since fixed date, add offset in seconds and then convert back to date and time in BCD. Look at the mktime() and gmtime() methods.

Jack Peacock