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A wrapper around time module primarily for testing purposes

	This class is a wrapper around time.time()  and time.gmtime(). When
	performing unit test, it is very useful to get a fixed value from
	these functions.  Thus, time.time() and time.gmtime() should never
	be called directly.  This wrapper should be called instead. The API
	are equivalent.
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S(	s�Convert time to a string representing as date and time using given format.
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s(?i)(?<=[a-z])(\d)s(\d)\s+(\d)s(?i)(?<=[\d\s])(%s)\bsdays?|da|dd?t
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S(s)Wraps string expression like "1h 2m 3s" into number contains seconds (3723).
		The string expression will be evaluated as mathematical expression, spaces between each groups 
		  will be wrapped to "+" operand (only if any operand does not specified between).
		Because of case insensitivity and overwriting with minutes ("m" or "mm"), the short replacement for month
		  are "mo" or "mon".
		Ex: 1hour+30min = 5400
		    0d 1h 30m   = 5400
		    1year-6mo   = 15778800
		    6 months    = 15778800
		warn: month is not 30 days, it is a year in seconds / 12, the leap years will be respected also:
		      >>>> float(str2seconds("1month")) / 60 / 60 / 24
		      30.4375
		      >>>> float(str2seconds("1year")) / 60 / 60 / 24
		      365.25	
		
		@returns number (calculated seconds from expression "val")
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