3 ms·

In mainframes, Julian dates are popular for that reason. YYDDD (day of year). When is 30 days after today? 25206+30

• alexanderchr 1y ago
  Maybe I’m missing something but then what is 30 days after Christmas? 25389?
  • mpyne 1y ago
    25389 mod 365, presumably. The very fancy mainframes probably would pick the appropriate modulus based on whether it was a leap year or not.
    • cortesoft 1y ago
      What happens when you want to add more than 365 days to a date, then?