Getting the timezone from a Yahoo WOEID

Question

I am using this question (yahoo-weather-api-woeid-retrieval) to convert a US ZIP to a Yahoo WOEID value. However while the Yahoo reply returns all sorts of interesting stuff, what I am interested in getting is the correct timezone of the location.

Is there any easy way to return the timezone from Yahoo, or map a WOEID (or ZIP in that matter) to a timezone value?

As a fall back if I get a weather forecast of a US WOEID, that data includes the local time with timezone at the time of the forecast (ie it returns EDT, PDT HST etc). So I can scrape the data from there, but I would prefer to associate it more with the location data. An example of this is:

<yweather:condition  text="Cloudy"  code="26"  temp="72"  date="Tue, 26 Oct 2010 11:03 am EDT" />

Edit

Going once, going twice ....