clock
Clock returns an array of integers v that contains the current time.
y=clock()
Outputs
y An array with following elements representing the current time:


    y[1]: year
    y[2]: month
    y[3]: day of month
    y[4]: hour of day 0-23
    y[5]: minutes into the curent hour
    y[6]: seconds into the curent minute
    y[7]: milli-seconds into the curent second