<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hello,<div><br></div><div>We utilize the C# library, <a href="http://zoneinfo.codeplex.com/Thread/View.aspx?ThreadId=50756">http://zoneinfo.codeplex.com/Thread/View.aspx?ThreadId=50756</a></div><div><br></div><div>This Loads the library into the application's cache as a global static variable and gives you direct access to zone conversions using the utc time and a zone name.</div><div><br></div><div>There are other solutions similar to this avaialble; but, I'm not sure from a C or C++ perspective.</div><div><br></div><div>Hope this helps</div><div><br></div><div><div>
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<br><div><div>On Feb 9, 2011, at 11:23 AM, Olson, Arthur David (NIH/NCI) [E] wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>I'm forwarding this message from Dario Teixeira, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately.<br><br><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span><span class="Apple-tab-span" style="white-space:pre"> </span>--ado<br><br>-----Original Message-----<br>From: Dario Teixeira [mailto:darioteixeira@yahoo.com] <br>Sent: Wednesday, February 09, 2011 11:03<br>To: <a href="mailto:tz@lecserver.nci.nih.gov">tz@lecserver.nci.nih.gov</a><br>Subject: C/C++ library that parses TZ data?<br><br>Hi,<br><br>I have a problem which is fairly common when one is running a web application<br>that wishes to display timestamps localised towards each user's time zone.<br>Basically, I need a function that takes as input a timestamp in UTC and <br>a time zone specified in the Zoneinfo convention (ex: "Europe/Lisbon"),<br>and returns the localised version of that timestamp, including a time zone<br>abbreviation aware of daylight savings. Example:<br><br>2010-01-01 15:30, "Europe/Lisbon" -> 2010-01-01 15:30 WET<br>2010-01-01 15:30, "Europe/Paris" -> 2010-01-01 16:30 CET<br><br>2010-07-01 15:30, "Europe/Lisbon" -> 2010-07-01 16:30 WEST<br>2010-07-01 15:30, "Europe/Paris" -> 2010-07-01 17:30 CEST<br><br>Since the zoneinfo data is present in every Unix system and glibc includes<br>routines for parsing it, interfacing with glibc seemed the obvious solution.<br>Unfortunately, glibc was not designed with this use case in mind. In fact,<br>the glibc interface to zoneinfo can be described as "sui generis" if one<br>is feeling charitable, or "insane" if truth must be told. Specifically, to<br>obtain the localised version of a given timestamp, one must first set the 'TZ'<br>environment variable with the target timezone, and then invoke 'localtime'.<br>The abbreviated name of the timezone can be found in the global 'tzname'<br>array: at position 'tzname[0]' if daylight savings are not in effect and at<br>position 'tzname[1]' if they are. A quick search through glibc's bugzilla<br>shows I'm not the only one to find this interface anachronistic [1], but it<br>also reveals that it is unlikely to change.<br><br>So, my question is if someone is aware of some alternative library in C <br>or C++ that provides this same functionality, but is friendlier towards<br>concurrent applications.<br><br>Best regards,<br>Dario Teixeira<br><br>[1] <a href="http://sources.redhat.com/bugzilla/show_bug.cgi?id=11620">http://sources.redhat.com/bugzilla/show_bug.cgi?id=11620</a><br><br><br><br><br><br><br></div></blockquote></div><br></div></body></html>