Bug #11755: ENV['TZ'] timezone

• Status: Third Party's Issue
• Assignee: -
• Target version: -
• ruby -v: 2.2.3
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN

[[e-mail] (Jon Xie)]

2.2.3 :001 > Time.now
 => 2015-12-01 11:35:06 +0800 
2.2.3 :002 > ENV['TZ'] = 'GMT+8'; Time.now
 => 2015-11-30 19:35:18 -0800 
2.2.3 :003 > ENV['TZ'] = 'GMT-8'; Time.now
 => 2015-12-01 11:35:24 +0800

Why is this so?

[[e-mail] (Jon Xie)]

System: OS X 10.10.5

[nobu (Nobuyoshi Nakada)]

• Subject changed from ENv['TZ'] timezone to ENV['TZ'] timezone
• Description updated (diff)
• Status changed from Open to Feedback

Seems correct output.
What do you expect?

[[e-mail] (Jon Xie)]

Nobuyoshi Nakada wrote:

Seems correct output.
What do you expect?

I'm expect:

ENV['TZ'] = 'GMT+8'; Time.now
 => 2015-12-01 11:35:06 +0800

What reason is this excuse me?

[phluid61 (Matthew Kerwin)]

Jon Xie wrote:

What reason is this excuse me?

Presumably you took 12 seconds between the first two commands, and then another 6 between the second and third. The clock keeps on ticking...

[[e-mail] (Jon Xie)]

Matthew Kerwin wrote:

Jon Xie wrote:

What reason is this excuse me?

Presumably you took 12 seconds between the first two commands, and then another 6 between the second and third. The clock keeps on ticking...

I'm sorry, I didn't describe clearly....

I think timezone should be '+0800'

ENV['TZ'] = 'GMT+8'; Time.now
 => 2015-12-01 11:35:06 +0800

And then it was '-0800 '

ENV['TZ'] = 'GMT+8'; Time.now
 => 2015-11-30 19:35:18 -0800

[[e-mail] (Jon Xie)]

TZ database https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
'Etc/GMT+8' corresponding UTC is '-08:00'

@Nobuyoshi Nakada @matthew (Matthew Johnson) Kerwin thanks

[nobu (Nobuyoshi Nakada)]

• Status changed from Feedback to Third Party's Issue

It's the convention.