Finding days past based on DS1307 Realtime Clock Module and Time library

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i'm using ds1307rtc library  http://www.pjrc.com/teensy/td_libs_ds1307rtc.html in conjunction rtc module , time library. i'm trying determine number of days have past, , i'm wondering best approach doing is.  can current day of month , subtract start day, complication comes fact different months different lengths. there easy way this?

days have "past" since what? storing values somewhere?

outside of that, it's math.
make array store number of days in each month, them & add together.


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