[tz] How to compute the moment of the next DST change

David Patte ₯ dpatte at relativedata.com
Tue Apr 2 11:38:00 UTC 2013

The tz file could be parsed itself as is being done in my free Windows 
product Time Zone Master, and a cron file produced from that. A new file 
would have to be generated after each release of the tz data files.

On 2013-04-02 4:58, Simon Perreault wrote:
> Dear time experts,
> I want to write a cron job or similar that activates one week prior to 
> daylight saving time changes. (Or, more generically, one week prior to 
> any time jumps, for any reason, DST or else.)
> Any pointers?
> I have looked at the usual places: POSIX time functions, various 
> date/time modules on CPAN, etc. Nothing seems to do that computation. 
> Do I need to parse the tz database myself?
> Thanks,
> Simon


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