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* Few changes have been made to make the date map accurate as reported by several contributors.
* 2062 BS Date changes and confirmed as per the Nepal RajPatra
* 2081 BS Date changes and confirmed as per the calendar published in 2081
* out of bound checks as suggested by Dipendra Nath (dipee), FIRST_AD_YEAR, LAST_AD_YEAR constanst introduced.
* 2.1.3 - Bump to push the change log