Hi, i am trying to measure time, here is my code unsigned long startTime = millis(); later... unsigned long currentTime = millis(); unsigned long elapsedTime = currentTime - startTime; How can I format millis into a 24 hour display?Should I use RTC? THANKS!

How to print millis in [hh:mm:ss] format?

system May 4, 2014, 8:46am 10

robtillaart:
The 1307 library comes with examples, have you checked them?

Yes, I have checked them.
I know how to display real time but don't know how to measure it.

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