57 

    58 * About timestamp.

    59 

    60   http://en.wikipedia.org/wiki/Timestamp

    61   http://en.wikipedia.org/wiki/Unix_time

    62   http://en.wikipedia.org/wiki/Leap_second

    63 

    64 ** Get timestamp.

    65 

    66 Current timestamp:

    67 

    68   $ date +%s

    69 

    70 Timestamp for specific date/time:

    71 

    72   $ date -d '2010-12-11' +%s

    73   $ date -d '2010-12-11 23:59:59' +%s

    74 

    75 ** Convert unix timestamp to date.

    76 

    77   $ date -d '1970-01-01 + 1234567890 seconds'

    78