Only the Time Zone and Daylight Saving Time settings are saved only in PRAM, not the current date or time. After resetting the PRAM, Time Zone and Daylight Saving Time settings are restored to their default factory settings which are:
- No Time Zone has been specified
- Daylight Saving Time checkbox is unchecked
The current date and current time settings are retained in a separate clock chip on the logic board. This clock is not reset unless the computer's external power and battery power are removed from the computer. Additionally, some Macintosh computers include a reset button on the logic board which also resets the current date and current time.