[UPHPU] building a dynamic calendar

[Daniel C.]

On 3/15/07, Brandon Stout <bms at mscis.org> wrote:
> BC will introduce complications here, and if you want to-the-second accuracy, there is a change in earth's rotation with every earthquake and potentially a resulting leap second or two - which can be forward or backward, depending on if the earth's rotation sped up or slowed down.  Plus the fact that leap year started some year AD.  All this, of course assumes you're using a Gregorian calendar.  Mayan, Aztec, Chinese, Hebrew, and many other calendars exist.

What is BC?  Also, the change of a couple of seconds either way isn't
enough to throw us off by anything greater than a day every century or
so.  So it's probably not really worth worrying about.

cal_days_in_month (and friends) support the Gregorian, Julian, Jewish
and French Revolutionary calendars.