01_date

1.definition
    date - print or set the system date and time
2.SYNOPSIS
    2.1 Display the current time in the given FORMAT.
        date []... [+FORMAT]
        FORMAT : refers to formatting symbols
            You can look it up in the man manual
    2.2 Set the system date.
        date [MMDDhhmm[[CC]YY][.ss]]
            MM : refers to month
            DD : refers to day
            hh : refers to hours
            mm : refers to minutes
            YY : refers to two-digit years
            CCYY : refers to four-digit years
            .ss : refers to seconds 
        e.g : Set the time to 17:01 am 21 seconds on August 15, 2015
            # date 0815170115.21