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Full Discussion: date comparison in bash
Top Forums Shell Programming and Scripting date comparison in bash Post 302334620 by rakeshawasthi on Thursday 16th of July 2009 06:06:22 AM
Old 07-16-2009
you seem to have missed 1 field
the correct format should be
Code:
YYYY:MM:DD:HH:mm:ss

or you wanted this only?

---------- Post updated at 03:36 PM ---------- Previous update was at 03:05 PM ----------

Try:
Since you wanted the diff in sec, I have left it in sec.
for the condition when the years are diff, you will have to add the condition.
Code:
#!/bin/bash

timeCalc()
{
   (( _diff = ($1*3600+$2*60+$3) - ($4*3600+$5*60+$6) ))
   return ${_diff}
}

date1=2009:07:15:12:36
date2=2009:07:15:12:16

echo $date1
echo $date2

_date1=$(echo $date1|awk -F":" '{print $1" "$2" "$3}')
_date2=$(echo $date2|awk -F":" '{print $1" "$2" "$3}')
_time1=$(echo $date1|awk -F":" '{$6==""?$6=0:$6=$6;print $4" "$5" "$6}')
_time2=$(echo $date2|awk -F":" '{$6==""?$6=0:$6=$6;print $4" "$5" "$6}')

dateDiff=$(datecalc -a ${_date1} - ${_date2})

if [[ $dateDiff -eq 0 ]]; then
   timeCalc ${_time1} ${_time2}
fi
echo Diff in second is ${_diff} sec.

PS: datecalc you will have to get from unix.com
 

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echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME
echo, noecho - enable/disable terminal echo SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib -R /usr/xpg4/lib -lcurses [ library... ] c89 [ flag... ] file... -lcurses [ library... ] #include <curses.h> int echo(void); int noecho(void); DESCRIPTION
The echo() function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially, curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control soft- ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined. RETURN VALUES
Upon successful completion, these functions return OK. Otherwise, they return ERR. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5) SunOS 5.10 5 Jun 2002 echo(3XCURSES)
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