Dell POWEREDGE 1855 - Manual (Page 45)

4. Enter the System Setup program.
If the date and time are not correct in the System Setup program, replace the battery. See " Server Module Battery " in "Installing System Options."
If the problem is not resolved by replacing the battery, see " Getting Help ."
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NOTICE: If the server module is turned off for long periods of time (for weeks or months), the NVRAM may lose its system configuration information. This
situation is caused by a defective battery.
NOTE: Some software may cause the server module's time to speed up or slow down. If the server module seems to operate normally except for the
time kept in the System Setup program, the problem may be caused by software rather than by a defective battery.