Panasonic KX-TG2584 Operating Instructions Manual page 14

" Settings
If a power failure occurs, the time/date flashes on the base unit
display. Adjust the date/time.
For Caller ID service users
≥The Caller ID information will reset the clock after the first ring if the adjusted
time and/or date is incorrect.
≥If the time has not previously been set, the Caller ID information will not
adjust the clock.
≥The Caller ID information will automatically adjust the clock for daylight
saving time.
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