Our RTC chips were designed to run from 2000 to 2100. We do not have a way to distinguish between 1900’s and 2000’s. The year register should only be programmed to a value between 00-99. If you are trying to write 2019, you should be writing 0x19 to register 0x07.
If you find that your RTC did not rollover properly, please check to see if you are programming the year register to 0xB9, which would refer to 119. The chip was not designed to hold register values higher than 100. For proper operation we recommend that you only program the register between 00 and 99.