Calculate Seniority Date Process to include all records from 1/1/1951

Summary:

We realized the "Legal Employer Seniority Date" was including Pending workers so we created a new one (to the right in green) - we would like to run the job to calculate the new rule on all records but what would we input in the Past Period in days? The New rule is effective 1/1/1951 and we would want this to recalculate all records.

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