add 2hours in current time

Shell Programming and Scripting
1

hi
i want to add 2hr ( or any hours inputed by user) to current time
and print it.
can any one help me with script.

eg suppose current date is "10-sep-2008 23:10:00"
and if i added 4hrs to it output should be "11-sep-2008 03:10:00"

i want to run shell script in "ksh"

2

One way is to change the TZ variable in the script. example you are in MST (+7), pick a timezone two hours earlier like EST

export TZ=MST7MDT
date
export TZ=EST5EDT
date

the 7 and the 5 are important you can make up 3 letter names for the timezone, or just reuse the current timezone. You can fudge time by as much as +12 -12 hours.

Otherwise see the datecalc script in Perderabo's thread 'Date Arithmetic' in the forums FAQ.

3

please post the output of your echo $TZ
if you have date -d option you can do it with date also just go through the man page

4

the TZ solution is probably the simplest. In case you need something more arbitrary, perl comes in really handy, but this can also be done with a combination of date and bc.

perl -e 'print "" . localtime(time()+$ARGV[0]) . "\n";' 7200

Here, 7200 represents 2 hours of seconds. The code above gets the current time in seconds, adds to it the contents of the first argument, and translates it back into standard "date" format.

5

If the OP has GNU date. The whole thing sounds like homework to me.

6

hi
guys
thanks for your reply. !!

cant it done using only shell scripting. without using perl or doing changes to system like changing TZ

7

Probably. Please read the site rules.

8

Try the below one.

9

i was trying to do same thing. but i thing on my machine date -d option is not available.

date: illegal option -- d
usage: date [-u] mmddHHMM[[cc]yy][.SS]
date [-u] [+format]
date -a [-]sss[.fff]
getting this thing
i am using SunOS 5.7