C# find time zone and time from given string of timestamp

C# find time zone and time from given string of timestamp

I need to parse the time and get the timezone from a string like the
following,
Timestampt = 2013-09-17T14:55:00.355-08:00
From the above string, I should be able to get time as 2:55pm and timezone
as EST (-8:00 mean est I guess)
Can anyone please let me know how the above can be done