Mohan-chhalotre's Gems

#	Total Rank	Daily Rank	Name	Summary
1	104,277	20,996	date_duration	The Duration Calculator calculates the number of days, months and years between two dates.
2	138,009	61,189	str_to_bool	A simple gem to convert a string to boolean , i.e. 'true'.to_bool, 'false'.to_bool