2 ms·

Blame the concept of zero for making things odd. Edit: what idiot downvotes this?

• adolph 5y ago
  Underrated comment. Since zero is even, is every number system with zero asymmetric? Also, the commonly used Common Era system for dates does not include a year zero, so it is symmetric. A year zero does not exist in the Anno Domini (AD) calendar year system commonly used to number years in the Gregorian calendar (nor in its predecessor, the Julian calendar); in this system, the year 1 BC is followed directly by year AD 1. However, there is a year zero in both the astronomical year numbering system (where it coincides with the Julian year 1 BC), and the ISO 8601:2004 system, the interchange standard for all calendar numbering systems, (where year zero coincides with the Gregorian year 1 BC; see conversion table). And there is a year zero in most Buddhist and Hindu calendars. https://en.wikipedia.org/wiki/Year_zero https://en.wikipedia.org/wiki/Year_zero