M.-A. Lemburg schrieb: > Christian Heimes wrote: >> Ben Finney wrote: >>> If you're committed to changing the epoch anyway, I would recommend >>> using <URL:http://en.wikipedia.org/wiki/Astronomical_year_numbering> >>> (epoch at 4004 BCE) since it is widely used to unify dates referring to >>> human history. >> I prefer JDN or MJD (http://en.wikipedia.org/wiki/JDN) for dates long >> before or after the unix epoch. The conversion from JDN as float to a >> datetime object is trivial. > > FWIW, mxDateTime can help you with all of those: > >>>> import mx.DateTime >>>> mx.DateTime.DateTimeFrom('1.1.4004 BCE') > <mx.DateTime.DateTime object for '-4003-01-01 00:00:00.00' at 2b534a46a2f0> >>>> mx.DateTime.DateTimeFrom('1.1.4004 BCE').jdn > 258994.5 >>>> mx.DateTime.DateTimeFromJDN(258994.5) > <mx.DateTime.DateTime object for '-4003-01-01 00:00:00.00' at 2b534aeb72f0> >>>> mx.DateTime.DateTimeFrom('1.1.4004 BCE').mjd > -2141006.0 >>>> mx.DateTime.DateTimeFromMJD(-2141006.0) > <mx.DateTime.DateTime object for '-4003-01-01 00:00:00.00' at 2b534a46a2f0> > > The supported date range is limited by the number of days > that fit into a C long. Should be enough for most use cases :-)
Nice ... :) I didn't know that mxDateTime has support for Julian Date. Christian -- http://mail.python.org/mailman/listinfo/python-list
