Timezone related questions

[Alexandre Pereira Nunes]

Hi,

I have an issue which I think I could solve using some glibc's timing 
routines, but perhaps I'm wrong or didn't find the right documentation, 
'cause so far I couldn't get there.

I have a few huge dbs with time information which were recorded at 
several locations around the word, therefore in various local timezones, 
some of which implements daylight saving times.

I now have to import those dbs into a consolidated one, and I must have 
a common reference time, so I though of converting those to utc, through 
determining whether DST was active or not by the time the information 
was generated, thus having the correct offset from GMT.

I see glibc has this sort of logic built-in, but it seems to apply only 
to realtime issues, i.e., timezone convertion functions seems to be 
relative to the local machine time. I was wondering if there is/was a 
interface to handle pasttime data like mine, or a pointer to how I could 
make something like that using that timezone db glibc brings in.

Sorry if this is answered somewhere else, I tried my best trying to 
figure that out. Any help is welcome.

Thank you,

Alexandre