Javascript/PHP and timezones

Question

I\'d like to be able to guess the user\'s timezone offset and whether or not daylight savings is being applied. Currently, the most definitive code that I\'ve found for this

Answer 1

If you want to rely on javascript you can simply send the utc time/timestamp back and forth and let the client convert it to its local time representation.

edit: simple self-contained example (using jquery)

  
    
    
    
  
  
    

    local time
  

If javascript is not available the user still sees a date/time though it's in UTC.
edit2: And there is a javascript library (or was it even a jquery plugin?) that does this kind of things plus some nifty conversions like "an hour ago", "last week" ..something like that. But I forgot the name :(