i've no problems with the keyboard. i can almost use every key i want.

i think i must describe my problem better.
when i only read the RTC the time and date are shown properly (except the year)

but when i change the value of the day/ month or year, the value shown on the screen is not correct. there must be a fault in my program. but after a month i still cannot find the problem. i'm programming in pascal.

in the datasheets are some figure's that show what every bit is used to do.
when i use these figure's and make a "formula" to change the value, i still can not find the right "calculation"