CODEWITHSUNDEEP
luatimezoneglibdstlgi
Lucas
Lucas

Reputation: 715

How to fix timezone/dst in lua's lgi?

Situation

It appears to me that my timezone is configured correctly because with

[nix-shell:~]$ date +"%T %Z"
19:49:07 CET

I get what I expect.

But with lua's lgi library I am appearently using Daylight Saving Time,whereas the normal lua functions honour the system settings:

[nix-shell:~]$ lua
Lua 5.2.4  Copyright (C) 1994-2015 Lua.org, PUC-Rio
> for k,v in pairs(os.date("*t")) do print(k,v) end
isdst   false
sec 31
min 51
month   11
day 12
hour    19
yday    317
wday    5
year    2020
> glib=require"lgi".GLib
> return glib.DateTime.new_now(glib.TimeZone.new()):format("%F %T %Z")
2020-11-12 20:51:52 CEST

Question

Where and how can I make lgi honour my systems timezone/DST settings?

Background

lgi is used by awesome WM for the clock widget, so I want it to be correct.

Upvotes: 1

Views: 264

Answers (2)

Lucas
Lucas

Reputation: 715

In my particular case my distribution did make a "mistake" when updating the zoneinfo file:

The problem was that the tzdata package did change the file format but the application (in my case aswesome WM) did not support the new format.

The solution was from the distribution was to install the new data files in the old format.

Upvotes: 0

Doyousketch2
Doyousketch2

Reputation: 2145

.new_local() calls .new() with the correct TZ env variable inside.

https://developer.gnome.org/glib/stable/glib-GTimeZone.html#g-time-zone-new

return glib.DateTime.new_now(glib.TimeZone.new_local()):format("%F %T %Z")

just make sure your TZ environment var is set properly.

https://www.cyberciti.biz/faq/linux-unix-set-tz-environment-variable

you'd think AwesomeWM would figure timezones out automatically, but who knows... OS.date is reporting that you're off DST properly, so would this do it?

if os.date('*t').isdst then
    wibox.widget.textclock( timezone='CEST' )
else
    wibox.widget.textclock( timezone='CET' )
end

Upvotes: 1

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