$ secondtime
Error : Incorrect argument(s).
Usage : secondtime <time> [format]

Help  : This program lets you use seconds as your unit of time.
        It has two basic functions:
        (1) Convert seconds to time units.
        (2) Convert time units to seconds.

        (1) To convert seconds, use it like so:

            	secondtime <number of seconds>

            The number of seconds may be any +ve real number.
            You can also express it in exponent form.
            Example: Convert 1.5 x 10^6 seconds.

                     $ secondtime 1.5e6
                     2w 3d 8h 40m

            (2 weeks, 3 days, 8 hours 40 minutes)

        (1.1) To convert to specific unit(s), use it like so:

              	secondtime <number of seconds> [unit(s)]

              To specify unit(s), just specify their suffix:
              years -> y, months -> M, weeks -> w, days -> d
              hours -> h, minutes -> m, seconds -> s
              Example: Convert 1.5 x 10^6 seconds to weeks and days.

                       $ secondtime 1.5e6 wd
                       2w 3.36111d

              (2 weeks, 3.36111 days)

        (2) To convert time to seconds, use it like so:

            	secondtime <time units with suffix>

            Write it like variables and coefficients in algebra.
            Example: Convert 2 weeks, 3 days, 8 hours and 40 minutes.

                     $ secondtime 2w3d8h40m
                     1.5e+06s

            (1.5 x 10^6 seconds)