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bug#11115: linux date arithmetic
From: |
Assaf Gordon |
Subject: |
bug#11115: linux date arithmetic |
Date: |
Mon, 15 Oct 2018 10:40:01 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 |
tags 11115 notabug
close 11115
stop
(triaging old bugs)
Hello,
On 28/03/12 06:39 AM, Stefan Karamuz wrote:
Please check the 2 linux commands:
date -d "$(date +%F\ %H:%M:%S)" +%F\ %H:%M:%S
date -d "$(date +%F\ %H:%M:%S) + 1 minute" +%F\ %H:%M:%S
It's very confusing, because the results of the two commands differ in
one hour and one minute, except of one minute only.
In version 8.26 (released 2016) date gained the "--debug"
option which can help in understanding such issues.
The "+1" is taken to be "UTC+1" time zone, as shown here:
$ date --debug -d "$(date +%F\ %H:%M:%S)" +%F\ %H:%M:%S
date: parsed date part: (Y-M-D) 2018-10-15
date: parsed time part: 10:35:21
date: input timezone: system default
[...]
$ date --debug -d "$(date +%F\ %H:%M:%S) + 1 minute" +%F\ %H:%M:%S
date: parsed date part: (Y-M-D) 2018-10-15
date: parsed time part: 10:35:27 UTC+01
date: parsed relative part: +1 minutes
date: input timezone: parsed date/time string (+01)
[...]
I'm closing this bug, but discussion can continue by replying to this
thread.
regards,
- assaf
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