how stupid of me to think that a REAL-TIME-CLOCK could actually keep real time. actually I would totally agree with all the measures, but it seems that should give mabye 5 year accuracy or something like that. I have seen the correction routines in some PLC's but that also seems , well OLD. I think you would need several days to TUNE your clock. The xtal I got from digikey was of the type, for rtc timing. ME, you are probably right that the 32,768 can't be 32,768.725 which would calculate out to x-added seconds.
Intersil has a RTC chip with some error adjustment registers, but same basic data format as 1307.
Who can make a small circuit board for SO-small outline 8 pin device and stuff, and how do you solder junk that small anyway.
don