Age_Calculator: months/days math produces impossible values (e.g. 18 months) #3322

Problem

Age_Calculator/Age_Calculator.py computes remaining_months and remaining_days with formulas that produce values >= 12 months and ignore month-length, giving nonsensical output.

Steps

cd Age_Calculator
python3 Age_Calculator.py
# Enter: 2000, 1, 15

Expected

Age: 26 years, 5 months, 19 days

Actual

Age: 26 years, 18 months, and 11 days

Bug at Age_Calculator/Age_Calculator.py:13-14:

remaining_months = abs((12-birthday.month)+today.month)
remaining_days = abs(today.day - birthday.day)

Formula adds instead of taking the wraparound modulo 12, and abs() on day-diff hides negative rollover instead of borrowing from months.

Environment

• OS: Ubuntu 22.04
• Python: 3.10.12
• Repo commit: main @ 2026-07-04

Thanks for maintaining avinashkranjan/Amazing-Python-Scripts!