date time

I recently noticed that one of my UNIX servers was about 4 hours behind the correct time. I wanted to correct the date and time manually. How do I set date and/or time under UNIX operating systems using command line options?


What is the correct format for a TZ (time zone) environment variable for use with the Linux or UNIX operating system?


How do I write an infinite loop in Bash script under Linux or UNIX like operating systems?


How do I display and insert current date and/or time under vi or VIM text editor?

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Q. How do I sort date type of data stored in a text file which is in following sample format:

Code         Date          TIME
HOS05	23/12/2008	10AM
HOS06	15/12/2008	2PM
HOS62	29/12/2008	10AM
HOS64	23/12/2008	2PM
HOS70	26/12/2008	10AM
ZFT01	06/12/2008	10AM
HOS73	11/12/2008	2PM
MHOS051	05/12/2008	10AM
MHOS041	20/12/2008	2PM
MHOS042	27/12/2008	2PM
MHOS053	11/12/2008	10AM
MHOS043	30/12/2008	2PM

How do I sort data date and time wise?