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Top Forums Shell Programming and Scripting Add or Subtract the hours,minutes or seconds in the the time variable Post 302891885 by anuragpgtgerman on Sunday 9th of March 2014 03:58:10 AM
Old 03-09-2014
Add or Subtract the hours,minutes or seconds in the the time variable

Hello All,

I am working on script where I need to add hours,minutes or seconds in the time.Time is not the current but it could be future time.I thought I can store that time in variable and add hours.minutes or second but I am not able to add that in the time that is stores in a variable.
Time is in specific format
Code:
Start_Time="May 12, 2012 10:00:00 AM MST"

I have another way which I Incorporated in my script which changes the time into GMT.But the problem is this method cause an issue when daylight saving system starts.MDT is fine during these days but if someone choose MST time zone it creates an issue.I am working on Linux system(x86_64) and bash shell
Code:
date "+%B %e, %Y %X" -u -d 'May 12, 2012 10:00:00 AM MDT'
output :->May 12, 2012 04:00:00 PM

date "+%B %e, %Y %X" -u -d 'May 12, 2012 10:00:00 AM MST'
output:->May 12, 2012 05:00:00 PM

 

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sttime(3)						    ShapeTools Toolkit Library							 sttime(3)

NAME
stMktime, stWriteTime - date and time handling SYNOPSIS
#include <config.h> #include <sttk.h.h> time_tstMktime (char *string); char*stWriteTime (time_t date); DESCRIPTION
stMktime scans the given string and tries to read a date and time from it. It understands various formats of date strings. The following is a list of all valid formats, optional parts in brackets. [Tue] Jan 5[,] [19]93 This includes the standard asctime(3) format. Jan 5 With no year given, the year defaults to the current year. [19]93/01/05 This notation requires month and day represented by exactly two digits. 5.1.[19]93 This is the usual German notation. 5.1. German notation referencing the current year. A certain time, given together with the date must always have the following form. hours:minutes[:seconds] Each of the fields must be an integer value within the proper range (hours: 0-23, minutes and seconds: 0-59). Values below 10 may be written as one digit numbers. The time value may be placed anywhere in the date string: at the beginning, at the end, or somewhere in the middle. Any amount of white- space may be given between a field of the time value and the separating colon. The time is always considered to be local time. stWriteTime generates a time string similar to asctime(3) from its date argument. SEE ALSO
asctime(3) BUGS
Time Zone Names within the time string (like `MET') are not handled properly. In most cases they will cause a failure. sttk-1.7 Thu Jun 24 17:43:35 1993 sttime(3)
All times are GMT -4. The time now is 12:42 AM.
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