[mplspm]: date/time questions

[arthur.goldstein at att.net]

I recommend

Calendrical Calculations: The Millennium Edition
by Edward M. Reingold (Author), Nachum Dershowitz (Author)

Copying the amazon.com editorial review:

This new edition of the successful calendars book is being published at the 
turn of the millennium and expands the treatment of the
previous edition to new calendars and variants. As interest grows in the impact 
of seemingly arbitrary calendrical systems upon our
daily lives, this book frames the world in a completely algorithmic form. The 
book gives a description of twenty-five calendars and
how they relate to one another: the Gregorian (current civil), ISO 
(International Organization for Standardization), Egyptian (and
nearly identical Armenian), Julian (old civil), Coptic, Ethiopic, Islamic 
(Moslem), modern Persian (both astronomical and arithmetic
forms), Baha'i (both present and future forms), Hebrew (Jewish), Mayan (long 
count, haab, and tzolkin), Balinese Pawukon,
French Revolutionary (both astronomical and arithmetic forms), Chinese (and 
nearly identical Japanese), old Hindu (solar and
lunisolar), and modern Hindu (solar and lunisolar). Easy conversion among these 
calendars is a by-product of the approach, as is
the determination of secular and religious holidays. Calendrical Calculations 
makes accurate calendrical algorithms readily available
for computer use with LISP, Mathematica, and Java code for all the algorithms 
included on the CD, and updates are available on
the Web. This book will be a valuable resource for working programmers as well 
as a fount of useful algorithmic tools for
computer scientists. In addition, the lay reader will find the historical 
setting and general calendar descriptions of great interest
> Dave's recent post on DateTime modules reminded me of a few questions I've 
> been trying to find answers to.
> 
> Does anybody have a good algorithm (or module) for converting between solar/
> lunar, Chinese, Thai, or any other "obscure" calendars (mostly eastern or 
> middle-eastern) and the normal calendar?  Anybody know of any books with 
> algorithms for this?
> 
> Anybody know what TD time is and how to convert TD <-> UTC?  Based on 
> content, I think TD is some astronomical measure of time.  The only good 
> Equinox algorithm I've found calculates in TD time - I know TD time matched 
> UTC time for some time LONG in the past, but there needs to be corrections 
> made (that keep growing as time passes) and I have no idea what the 
> correction/conversion alorithm is.
> 
> 
> 
> 
> --------------------------------------------------
> Minneapolis Perl Mongers mailing list
> 
> To unsubscribe, send mail to majordomo at pm.org
> with "unsubscribe mpls" in the body of the message.




--------------------------------------------------
Minneapolis Perl Mongers mailing list

To unsubscribe, send mail to majordomo at pm.org
with "unsubscribe mpls" in the body of the message.