Sponsored Content
Top Forums Shell Programming and Scripting Date command - subtract from given time Post 302906923 by Perderabo on Tuesday 24th of June 2014 12:13:05 PM
Old 06-24-2014
It's probably too late to help SkySmart, but I thought that I would post a followup anyway. In another thread I saw Corona688 perform date arithmetic via the -d parameter to date. This led me to believe that time arithmetic should be possible too.

I had trouble getting it to work and all the problems centered around timezone computations. The first thing following the time is assumed to be a timezone offset. Therefore I had to supply a superfluous +0000 to get past that. Next I had to defeat the normal timezone computation and I used -u to do that. Putting it all together...
Code:
$
$ date  -u -d"12:13:00 +0000 -10 min" '+%H:%M:%S'
12:03:00
$ date  -u -d"12:13:00 +0000 +10 min" '+%H:%M:%S'
12:23:00
$

This User Gave Thanks to Perderabo For This Post:
 

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Subtract date & time in diferent rows

Hi Friends :) I have a long file having fields in the form : Field1 yy/mm/dd hh:mm:ss Duration(Sec) line 1) 123123 05/11/30 12:12:56 145 line 2) 145235 05/11/30 12:15:15 30 line 3) 145264 05/11/30 13:14:56 178 . . I want to subtract yy/dd/dd hh:mm:ss in line (2) from yy/mm/dd hh:mm:ss in... (1 Reply)
Discussion started by: vanand420
1 Replies

2. Shell Programming and Scripting

Subtract Time

Hello, Im writing a script using the ksh shell. I have 2 variables in the script: CURRTIME PREVTIME Example, if CURRTIME=13:00, I want to somehow calculate what the time was an hour ago so that PREVTIME=12:00 Right now I have the following: CURRTIME=`date +%H:%M` How can I... (4 Replies)
Discussion started by: xadamz23
4 Replies

3. Shell Programming and Scripting

subtract minutes from time

i have the time 20100421043335 in format (date +%Y%m%d%H%M%S),and i want to be able to get the previous time 2 minutes ago,which is 20100421043135 (9 Replies)
Discussion started by: tomjones
9 Replies

4. Shell Programming and Scripting

Add/Subtract Time

need some help on the below requirement: File1: SV,22,20100501140000,JFK,RUH SV,29,20100501073000,BOM,RUH SV,29,20100501073000,SIN,RUH third filed is datetime which is of the format (yyyymmddhh24miss) File2 JFK,+,0500 BLR,-,0530 SIN,-,0800 for every line of file 1, take 4... (9 Replies)
Discussion started by: ssantoshss
9 Replies

5. Shell Programming and Scripting

Subtract Seconds from Date Command

Hi, Need to subtract 5 seconds after syncing my Linux server from NTP like; #ntpdate time.myorg.int. This script will only run once in each morning at 9 AM. Please help me. (4 Replies)
Discussion started by: refra
4 Replies

6. UNIX for Dummies Questions & Answers

How to chnage format and subtract time and date and get average.?

Hello All , Please support for below request how to change format and subtract time and date and get average. xxx 13-OCT-15 11.32.18.241000 AM 13-OCT-15 11.35.49.089080 AM xxx 13-OCT-15 11.32.24.000000 AM 13-OCT-15 11.45.17.810904 AM xxx 13-OCT-15 11.32.25.232000 AM ... (1 Reply)
Discussion started by: mirwasim
1 Replies

7. Shell Programming and Scripting

Subtract time in two line

INPUT: 16:45:51 10051 77845 16:45:51 10051 77845 16:46:52 10051 77846 16:46:53 10051 77846 Match the last PID then subtract second line time with first line. Please help me with any command or script. (3 Replies)
Discussion started by: vivekn
3 Replies

8. Shell Programming and Scripting

Subtract a file's modification date with current date

SunOS -s 5.10 Generic_147440-04 sun4u sparc SUNW,SPARC-Enterprise Hi, In a folder, there are files. I have a script which reads the current date and subtract the modification date of each file. How do I achieve this? Regards, Joe (2 Replies)
Discussion started by: roshanbi
2 Replies

9. HP-UX

awk command in hp UNIX subtract 30 days automatically from current date without date illegal option

current date command runs well awk -v t="$(date +%Y-%m-%d)" -F "'" '$1 < t' myname.dat subtract 30 days fails awk -v t="$(date --date="-30days" +%Y-%m-%d)" -F "'" '$1 < t' myname.dat awk command in hp unix subtract 30 days automatically from current date without date illegal option error... (20 Replies)
Discussion started by: kmarcus
20 Replies
DM_DATE(1)						User Contributed Perl Documentation						DM_DATE(1)

NAME
dm_date - print out the system date and time SYNOPSIS
This performs the same operation as the unix 'date' command, but using the Date::Manip module. dm_date [OPTION]... [+FORMAT] DESCRIPTION
This displays information about the current system time, or some other time. Options are: -h, --help Print online help. -d STRING, --date=STRING Display time described by STRING. STRING can be any string which can be parsed by Date::Manip. Please refer to the Date::Manip::Date documentation for details. -f DATEFILE, --file=DATEFILE This reads each line in DATEFILE, and extracts a date from it and prints out the information. Blank lines and lines starting with a pound (#) are ignored. Lines not containing a valid date are also ignored. -r FILE, --reference=FILE Displays the last modification time of FILE. -R, --rfc-2822 Displayc the date and time in RFC 2822 format. Example: Mon, 07 Aug 2006 12:34:56 -0600 -u, --utc, --universal Converts the date to UT (GMT) and prints out the information. Only one of -d, -f, or -r should be included. If more than one is included, the first one from the list (-d, -f, -r) is used and any other is ignored. The format string starts with a plus (+) and contains any of the format directives described in Date::Manip::Date. KNOWN BUGS
None known. BUGS AND QUESTIONS
Please refer to the Date::Manip::Problems documentation for information on submitting bug reports or questions to the author. SEE ALSO
Date::Manip::Date LICENSE
This script is free software; you can redistribute it and/or modify it under the same terms as Perl itself. AUTHOR
Sullivan Beck (sbeck@cpan.org) perl v5.16.3 2014-06-09 DM_DATE(1)
All times are GMT -4. The time now is 08:54 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy