Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32ZG14P/EFR32ZG14P731F256GM32/RTCC/DATE#0x0
Date Register
Day of Month, Units
Day of Month, Tens
Month, Units
Month, Tens
Year, Units
Year, Tens
Day of Week
https://github.com/cmsis-svd/cmsis-svd-data