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Working with bash and date

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# 1  
Old 01-19-2011
Working with bash and date
Hello all,

I'm trying to substract 1 minute from the current date and take the hour and minute (for filename purpose).

1) If I want hour an minute from current time I can use:
Code:
timetmp=$(date +"%H:%M")

2) To substract 1 minute from current time I can use:
Code:
timetmp=$(date --date "$dte -1 minute")

Well now, how can I extract the minute and hour from example 2 like on example 1?

Could some1 please help me with this (i hope) simple trouble?
Thanks
# 2  
Old 01-19-2011
Code:
timetmp=$(date --date "$dte -1 minute" +"%H:%M")

This User Gave Thanks to Chubler_XL For This Post:
Lord Spectre
# 3  
Old 01-19-2011
omg... I realize right now that it was very simple!!! Smilie

I used:
timetmp=$(date +%H%M --date "$dte -1 minute")

Btw, thanks Chubler_XL! Smilie
# 4  
Old 01-19-2011
BTW if you're doing a bit of date calculations a good trick is to convert your dates to seconds past epoch they you can add/subtract seconds as you like using shell, or even find the difference between two dates.

From date to epoch time date -d Jan-10-2011 +%s
From epoch time to date date -d @1294581600 +%b-%d-%Y
This User Gave Thanks to Chubler_XL For This Post:
Lord Spectre
# 5  
Old 01-20-2011
If you have not GNU date, then ex. ksh93 is a solution:
Code:
epoc=$(printf "%(%s)T" "2010-10-24")
epoc=$(printf "%(%s)T" "2010-10-24 00:00:00")
epoc=$(printf "%(%s)T" "10/24/2010 00:00:00")
# day is 86400 s (60*60*24)
((yesterday=epoc-86400))
printf  "%(%Y-%m-%d)T"     "#$yesterday"

This User Gave Thanks to kshji For This Post:
Lord Spectre
# 6  
Old 01-20-2011
Guys, please help.
I make all my test under ubuntu and redhat 5 and all working fine.
The problem is that my script should run under SunOS where the bash version is:
GNU Bash-2.05

SunOS version is
SunOS rmcs 5.9 Generic_118558-09 sun4u sparc SUNW,Sun-Fire-V440

So the previous commands doesn't works. It show me the HHMM but it doesn't substract any time!!!

Code:
root@rms /# timetmp=$(date +%H%M --date "$dte -1 minute")
root@rms /# echo $timetmp
1307
root@rms /# date
Thu Jan 20 13:07:31 CET 2011

Is there any other commands??
# 7  
Old 01-20-2011
date under solaris doesn't have some of the nice features...

you could try:

Code:
#  date;perl -e 'print scalar(localtime(time()-60))."\n"'
Thu Jan 20 12:24:32 GMT 2011
Thu Jan 20 12:23:32 2011

or have a look at the FAQ: https://www.unix.com/answers-frequent...rithmetic.html

HTH
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