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When the date of the start month lies above the possible days of the target month (e.g. January [31 days] to February [28 days, except in leap years] or March [31 days] to April [30 days], the end of a period falls a day short.

E.g. for the probation period the date it is calculated:

prob_period_lst.insert(1, min(prob_period_lst[0].shift(months=+prob_period_dur, days=-1), termination_dt))

When entering 2020-01-20 as start date with a probation period of one month, the target date incorrectly lands on 2020-02-28 (should be 2020-02-29, since it is a leap year.

Similarly, when entering 2020-03-31 as start date with a probation period of one month, the target date incorrectly lands on 2020-04-29 (should be 2020-04-30).

Issue only occurs where months are shifted and a day is subtracted from the result, currently:

• Calculation of probation period
• Sick pay for BS and BE