Date And Time in unix linux !!!!

How to change date and time in linux?
To set the system clock under Linux, use the date

command. As an example, to set the current time and date to July 31,
11:16pm, type ``date 07312316'' (note that the time is
given in 24 hour notation). If you wanted to change the year as well,
you could type ``date 073123161998''. To set the seconds
as well, type ``date 07312316.30'' or ``date
073123161998.30''. To see what Linux thinks the current local
time is, run date with no arguments.
Other ToolBar related

• rdate - get the current time from a remote machine;
  can be used to set the system time.
• xntpd - like rdate, but it's extremely
  accurate and you need a permanent 'net connection. xntpd
• Runs continuously and accounts for things like network delay and clock
  drift, but there's also a program (ntpdate) included that
  just sets the current time like rdate does.