I’m no expert but I assume that the year Christ died would be “year zero” (assuming you’re talking about anno Domini (AD) and before Christ (BC)) since we started counting after that.
Zero exists, just not for the Gregorian calendar that follows the Anno Domini calendar numbering system (BC/AD). It is very true for Julian calendars that follow the astronomical year numbering system (BCE/CE) as well as Gregorian calendars that follow the ISO8601:2004 standard (no unit), as well as Holocene calendar, and numerous Hindu/Buddhist calendars.
I’m no expert but I assume that the year Christ died would be “year zero” (assuming you’re talking about anno Domini (AD) and before Christ (BC)) since we started counting after that.
Zero exists, just not for the Gregorian calendar that follows the Anno Domini calendar numbering system (BC/AD). It is very true for Julian calendars that follow the astronomical year numbering system (BCE/CE) as well as Gregorian calendars that follow the ISO8601:2004 standard (no unit), as well as Holocene calendar, and numerous Hindu/Buddhist calendars.
1 BC = 0 BCE = 10000HE -> 0AD = 0CE = 10001HE