FW: Fingerprinting timezones
Olson, Arthur David (NIH/NCI) [E]
olsona at dc37a.nci.nih.gov
Tue Aug 9 04:16:02 UTC 2011
I'm forwarding this message from Conrad Irwin, who is not on the time zone mailing list. Those of you who are on the list, please direct replies appropriately. --ado
From: Conrad Irwin [mailto:conrad.irwin at gmail.com]
Sent: Monday, August 08, 2011 7:59
To: tz at lecserver.nci.nih.gov
Subject: Fingerprinting timezones
Thank you for the timezone database - it is a phenomenal resource.
The problem I would like to solve is that of having to ask a user of a
web-app for their timezone. While there is no way to directly query
capable of telling me the offset from UTC at any date.
It seems like, by selecting some number of dates to query, I should be
able to gather enough information to uniquely identify any given
timezone (or at least make a very good guess for a large proportion of
Before I embarked on doing this, I wanted to ask if anyone has seen a
similar attempt in the past? Are there some "gotchas" that mean that
this isn't actually as feasible as I naïvely hope?
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