Let's find out how to set Date and time via command line on linux and windows:

• 
  

  On Linux via terminal

  
  System time (Must have sudo privilege)
  
  date -s '2015-07-28 15:27:30'
  Hardware time
  
  Let's set the hardware clock to the current system time:
  
  hwclock --systohc
  

• On Windows via command prompt terminal

  System time (Must have Administrator privilege)
  date
  The current date is: 07/28/2015
  Enter the new date: (mm-dd-yy)_
  time
  The current time is: 15:34:03.44
  Enter the new time: _