Hi,
Looks to me like you're multilpexing the display, right?

Have loop counter variable incremented each time you get to the citeste_RTC routine. After reading the DS1307 you look at this loop counter and if it's less than say 10000 (or whatever) you jump jump to the routine displaying the time, if it more than 10000 you jump to the routine displaying the date. If it hits 20000 (in this case) you reset it to 0 and the whole thing starts over.

/Henrik.