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Add or Subtract the hours,minutes or seconds in the the time variable

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# 1  
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

# 2  
Old 03-09-2014
Im not sure I understand your problem. Daylight saving time should be one hour ahead, so your results should be correct, no?
# 3  
Old 03-09-2014
This problem is when the person who is working from India choose the time in MST to create the Instance it doesn't create the Instance with the correct time
If I choose time 10 AM MST then it coverts the time to 5 PM GMT and it means if u add 5:30 hours in that GMT time (5+5:30)then according to India it will schedule the instancne at 10:30 am which is not correct it should schedule the instance at 9:30 am according to India
# 4  
Old 03-09-2014
Then you have to control the users' input data, not the date/time algorithm. You can check it with various methods: in a shell script, or by using awk or similar ...
# 5  
Old 03-09-2014
If the time is sync-ed, it doesn't matter from which part of the world you are issuing the command. You need to get the user-input right for the right output.
# 6  
Old 03-09-2014
Can you please let me know one thing how could I add or subtract hours,minutes or seconds for the time that is store in a variable.I know how to do from the current time but not able to do that from the time that is stored in a variable
# 7  
Old 03-09-2014
Using GNU date
Code:
root@maximus:/tmp# echo $dd
2014-03-09 17:38:55

root@maximus:/tmp# date -d "$dd 1 hour" "+%Y-%m-%d %H:%M:%S"
2014-03-09 18:38:55
root@maximus:/tmp# date -d "$dd 1 min" "+%Y-%m-%d %H:%M:%S"
2014-03-09 17:39:55
root@maximus:/tmp# date -d "$dd 1 sec" "+%Y-%m-%d %H:%M:%S"
2014-03-09 17:38:56

root@maximus:/tmp# date -d "$dd 1 hour ago" "+%Y-%m-%d %H:%M:%S"
2014-03-09 16:38:55
root@maximus:/tmp# date -d "$dd 1 min ago" "+%Y-%m-%d %H:%M:%S"
2014-03-09 17:37:55
root@maximus:/tmp# date -d "$dd 1 sec ago" "+%Y-%m-%d %H:%M:%S"
2014-03-09 17:38:54

Saving it in another variable
Code:
root@maximus:/tmp# new_date=$( date -d "$dd 1 sec ago" "+%Y-%m-%d %H:%M:%S" )
root@maximus:/tmp# echo $new_date
2014-03-09 17:38:54

Change the date format as you want.

HTH
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