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Full Discussion: Arithmetic on timestamps
Top Forums Shell Programming and Scripting Arithmetic on timestamps Post 302298233 by reddysiva on Tuesday 17th of March 2009 03:34:48 AM
Old 03-17-2009
if you know time diffrence
try this

[root@Reddyraja reddy]# date +"%F %T"
2009-03-17 12:53:11
to add 10 minutes
[root@Reddyraja reddy]# date +"%F %T" -d" 10 minutes"
2009-03-17 13:03:13
to subtract 10 minutes
[root@Reddyraja reddy]# date +"%F %T" -d" 10 minutes ago"
2009-03-17 12:43:16


[root@Reddyraja reddy]# date +"%F %T" -d" 5 days 10 minutes ago"
2009-03-22 12:45:47
[root@Reddyraja reddy]# date +"%F %T" -d" 5 days ago 10 minutes ago"
2009-03-12 12:46:01
[root@Reddyraja reddy]# date +"%F %T" -d" 5 days ago 10 minutes "
2009-03-12 13:06:14
[root@Reddyraja reddy]# date +"%F %T" -d" 5 days 10 minutes "
2009-03-22 13:06:19


find unix time stamp in GST
and export TZ=EST

[root@Reddyraja reddy]# export TZ=IST
[root@Reddyraja reddy]# date +%s
1237275038
[root@Reddyraja reddy]# date +"%F %T" -d@1237275038
2009-03-17 07:30:38
[root@Reddyraja reddy]# export TZ=EST
[root@Reddyraja reddy]# date +"%F %T" -d@1237275038
2009-03-17 02:30:38
 

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LEARN ABOUT CENTOS

pmdate

PMDATE(1)						      General Commands Manual							 PMDATE(1)

NAME

       pmdate - display an offset date

SYNOPSIS

       pmdate [ offset ... ] format

DESCRIPTION

       pmdate displays the current date and/or time, with an optional offset.

       An offset is specified with a leading sign (``+'' or ``-''), followed by an integer value, followed by one of the following ``scale'' spec-
       ifiers;

       S      seconds
       M      minutes
       H      hours
       d      days
       m      months
       y      years

       The output format follows the same rules as for date(1) and strftime(3).

       For example, the following will display the date a week ago as DDMMYYYY;
	       pmdate -7d %d%m%Y

PCP ENVIRONMENT

       Environment variables with the prefix PCP_ are used to parameterize the file and directory names used by PCP.  On  each	installation,  the
       file  /etc/pcp.conf contains the local values for these variables.  The $PCP_CONF variable may be used to specify an alternative configura-
       tion file, as described in pcp.conf(5).

SEE ALSO

       date(1), strftime(3), pcp.conf(5) and pcp.env(5).

Performance Co-Pilot							PCP								 PMDATE(1)
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