I recently installed 14.04, and my date/time display is unnecessarily localized. Upon installation, I chose Colombo as my location:

Now the date/time is displayed in localized form (Sinhala language). I don't remember choosing a language any other than English (US).

How do I revert this to show date/time display in English (US)?

Edit: Executing locale on console produces following:

LANG=en_US.UTF-8

LANGUAGE=en_US

LC_CTYPE="en_US.UTF-8"

LC_NUMERIC=si_LK

LC_TIME=si_LK

LC_COLLATE="en_US.UTF-8"

LC_MONETARY=si_LK

LC_MESSAGES="en_US.UTF-8"

LC_PAPER=si_LK

LC_NAME=si_LK

LC_ADDRESS=si_LK

LC_TELEPHONE=si_LK

LC_MEASUREMENT=si_LK

LC_IDENTIFICATION=si_LK

LC_ALL=