allow formatting dates in various timezones
timezone dates in emails
add unit test and fix offset
Don't append timezone abbreviation to times
remove test for timezone abbreviation
Tweaked tenant timezone test
Merge branch 'emailtz'

* emailtz:
  Tweaked tenant timezone test
  remove test for timezone abbreviation
  Don't append timezone abbreviation to times
  add unit test and fix offset
  timezone dates in emails
  allow formatting dates in various timezones