calendar.elapsed: make generic for more convenience.
calendar.elapsed: make generic for more convenience.

bpollack/factor,bjourne/factor,mrjbq7/factor,nicolas-p/factor,AlexIljin/factor,AlexIljin/factor,slavapestov/factor,tgunr/factor,slavapestov/factor,AlexIljin/factor,tgunr/factor,AlexIljin/factor,tgunr/factor,bjourne/factor,tgunr/factor,bpollack/factor,nicolas-p/factor,slavapestov/factor,factor/factor,bjourne/factor,bpollack/factor,bjourne/factor,factor/factor,bpollack/factor,slavapestov/factor,factor/factor,mrjbq7/factor,AlexIljin/factor,bpollack/factor,nicolas-p/factor,bpollack/factor,nicolas-p/factor,mrjbq7/factor,bjourne/factor,slavapestov/factor,AlexIljin/factor,bpollack/factor,nicolas-p/factor,factor/factor,tgunr/factor,nicolas-p/factor,factor/factor,mrjbq7/factor,mrjbq7/factor,mrjbq7/factor,nicolas-p/factor,factor/factor,tgunr/factor,slavapestov/factor,bjourne/factor,AlexIljin/factor,bjourne/factor,slavapestov/factor