I need a calculator for increase of pay increment for a part-time employee, where there are several possible results.
Example:
Promotion date = 10 Jul 13
If they worked full-time the increment increase date is 12 mth anniversary of promotion = 10 Jul 14
If they worked part-time, then increment increase date is the day they worked 100 days but no earlier than 12 mth anniversary and no later than 24 month anniversary.

So might be a series of questions:
Promotion = 10 Jul 13
1. Did person work full-time? If yes, increment date = 12 mth anniversary
2. If no, next question. What date did the member work 100 days after promotion?
If date earlier than 10 Jul 14, increment date = 12 mth anniversary
If date is between 10 Jul 14 and 10 Jul 15, increment date equals date of 100th day of work
If date later than 10 Jul 15, increment date = 24 mth anniversary

Any help, including pointing me to a previous post, would be greatly aprreciated. Thanks.