HR
Probation Calculator
Work out an employee's probation end date from their start date and probation period length.
How the calculation works
Add the probation period to the employee's start date to get the probation end date. Months are approximated at 30 days each, since calendar months vary from 28 to 31 days, so a months-based result can land a day or two off a policy that counts to a specific calendar date (like 'the 90th day' vs. 'three calendar months') instead.
Formula
Probation End Date = Start Date + Probation Period (converted to days).
Examples
Starts Aug 10, 2026, 90 days probation
Probation ends: Nov 8, 2026
Starts Aug 10, 2026, 6 months probation
Probation ends: Feb 6, 2027 (approximate)