You can certainly add past punch clock details, but you'll need to open a custom payroll period first. From the Tools menu, choose Payroll Period. Note your current payroll period settings so you can revert back to them when you're done. Change the payroll frequency to User Defined. Set the period start date to the earliest date you have records for. Set the period end date to the current date and save. Now you can add the historic punches as manual entries. When you're all done, you can reset your payroll settings back to what they should be.
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