Use current offset instead of offset in 1970 year

IE and may be safari on mac
Moscow (+4h now)

Before:
new Date( '2014-01-01T00:00:00' ) -> Wed Jan 01 2014 01:00:00 GMT+0400 

After:
new Date( '2014-01-01T00:00:00' ) -> Wed Jan 01 2014 00:00:00 GMT+0400