Olympus IR-500 Reference Manual page 40

Setting the date and time
5
Press 9 to confirm the date and time settings.
The clock starts at the same time you press 9.
Note
The date and time settings will be canceled if the camera is left with the battery removed for more than one
day (under the standard Olympus testing conditions). If this occurs, set the date and time again. The date and
time settings will be canceled earlier if the battery has been loaded for a short period of time.
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