Please keep in mind that if any punches were altered after the timestamp, the original punch will show up again.
Go to Setup > Communications, and double-click on [clock group].
Click on "Clock Tools" at the bottom right.
Old Firmware:
Select the clock(s) you wish to reset the timestamp for then type in the date and time you want the clock from which you want the clock(s) to reupload punches from memory.
Now, Click "Set Attendance Log Timestamp".
When prompted to confirm the Timestamp change, click OK.
Click OK at the confirmation message:
Click Reboot. When prompted to confirm the command, click OK. (Yes, do this immediately before Clicking Set Attendance Log Timestamp)
Click OK at confirmation message.
Click Close, then click Cancel.
New firmware:
Enter the following, substitute the values for StartTime and EndTime:
Option:
CMD DATA
Value:
QUERY ATTLOG StartTime=2019-12-27 00:00:00{tab}EndTime=2019-12-30 23:59:00
Click Set Option.
You do not need to reboot.
Click Close, then click Cancel.