Usage: showdate [-hvu] [-f fmt] [-c file] [-m file] [--add-days=n] [--sub-days=n] [--add-hours=n] [--sub-hours=n] [--add-minutes=n] [--sub-minutes=n] [--add-seconds=n ...
NOTE: This library has a large memory footprint and is intended for hardware such as the SAMD51, ESP32-S2, and nRF52.