Shell Programming and Scripting

Hey Guys,

I have looked for a solution throughout the forum for my particular question, but I cant find one. So I'm sorry if I overlooked it. I need to be able to 48 add hours to a particular DateTime string.

I have a variable named $startTime

I would like to be able to take that $startTime and add 48 hours. The variable format is ""%Y%m%d_%H00"

So currently $startTime = "20130419_1400" (Z Time)

Can I use the following command in shell somehow and just input the $startTime variable instead of the system date call?

endTime=$(date -d "48 Hours" "+%Y%m%d_%H00")

Have a read of this to see if it helps:-

Korn Shell 93 Date/Time String Manipulation and Arithmetic

It is referenced in this post:-

https://www.unix.com/shell-programmin...te+calculation

There are lots of others here if you search for "date calculation"


If you are using AIX, there is also the cheat of forcing the time zone.

Code:

$ print "$TZ"
GMT0BST,M3.5.0,M10.5.0
$ date
Fri 19 Apr 16:19:41 2013
$ TZ=GMT-48BST,M3.5.0,M10.5.0
$ date
Sun 21 Apr 16:19:46 2013

I don't know how many OS variants support this.



I hope that this helps.


Robin
Liverpool/Blackburn
UK