title: How to obtain the current time differences between two timezones
body: <p>I want to calculate the current time differences between US/Central timezone and British Summer Time. I mean, currently these both timezones have daylight savings going on, so they have a 6 hours time difference. But after Sunday October 31 2010, daylight savings will be off for British summer time, at which moment there will be a 5 hours time differences between these two timezones. </p>
  
  <p>Is there any way I can calculate these varying time differences?</p>