> I'm having trouble coming up with a good approach to take here. The > main issue is daylight savings time. It's fairly trivial for me to > write a Java program that builds a list of timezone ID's and their > associated GMT offsets, and using that list to give the C++ > application the info it needs for the conversion, but I have not been > able to come up with a good way to support daylight savings time (and > also to support the dst-adjusted display names of timezones, e.g. > "EST" vs "EDT" for EST5EDT) in the C++ application short of > reimplementing all of the logic for every timezone ID by hand -- which > is less than ideal. > > I realize this may be slightly off topic, but it is related to Joda. > Apologies if this is the wrong place to ask... but I have not been > able to come up with any solutions. Has anybody here ever done > anything like this, or does anybody have any ideas about a good way to > add Joda timezone ID support to non-Java applications? Ideally I'd > like to support most of the Joda timezone IDs (both generic IDs like > "EST5EDT" and city IDs like "America/New_York"), but I would be > willing to limit the Java application to a representative subset of > the IDs if that makes it easier to deal with on the C++ side of > things. Any suggestions would be greatly appreciated.
The timezone IDs aren't actually Joda-specific, they're ids from the public domain tz database. See http://www.twinsun.com/tz/tz-link.htm. They also provide a C library for accessing the timezone data, and the same database backs most standard time implementations (such as GNU libc's). As long as you use the same version of the data file in both Joda-Time and whatever other library you choose, they should work fine together. (Not using the same version just opens you up to displaying the same instant differently in the different programs since the definition of daylight savings time may have changed for some geographies in between the versions, of course.) - Adam ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Joda-interest mailing list Joda-interest@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/joda-interest
