note
	description: "Functions useful in time calculations"
	legal: "See notice at end of class."
	status: "See notice at end of class."
	date: "$Date: 2009-01-01 12:38:30 +0000 (Thu, 01 Jan 2009) $"
	revision: "$Revision: 76534 $"

class 
	TIME_UTILITY

create 
	default_create

feature -- Basic operations

	mod (i, j: INTEGER_32): INTEGER_32
			-- (i \\ j) if i positive
			-- (i \\ j + j) if i negative
		do
			Result := i \\ j
			if Result < 0 then
				Result := Result + j
			end
		ensure
			positive_result: Result >= 0
			result_definition: i = j * div (i, j) + Result
		end

	div (i, j: INTEGER_32): INTEGER_32
			-- (i \\ j) if i positive
			-- (i \\ j + 1) if i negative
		do
			Result := i // j
			if Result.to_double > i / j then
				Result := Result - 1
			end
		ensure
			result_definition: i = j * Result + mod (i, j)
		end
	
feature -- Access

	Date_time_tools: DATE_TIME_TOOLS
			-- Tools for outputting dates and times in different formats
		once
			create Result
		end

	default_format_string: STRING_8
			-- Default output format string
		do
			Result := Date_time_tools.Default_format_string
		end
	
note
	copyright: "Copyright (c) 1984-2009, Eiffel Software and others"
	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
	source: "[
		Eiffel Software
		5949 Hollister Ave., Goleta, CA 93117 USA
		Telephone 805-685-1006, Fax 805-685-6869
		Website http://www.eiffel.com
		Customer support http://support.eiffel.com
	]"

end -- class TIME_UTILITY

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