POSIX-TZ and last transition time

[yorickhardy]

I tried the following code fragment:

local luatz = require("luatz")

local sydney_ts = luatz.time_in("Australia/Sydney")
sydney = luatz.timetable.new_from_timestamp(sydney_ts)

print(sydney)
print(os.date("!%c", sydney_ts))
os.execute("env TZ=Australia/Sydney date")

and the output:

2023-03-15T15:58:08.000
Wed Mar 15 15:58:08 2023
Wed Mar 15 16:58:08 AEDT 2023

differs by an hour. Looking through the code, it seems like the TZ entry is not used "in handling instants after the last transition time stored in the file" as per the documentation for the Version 2 tzfile format:

Linux tzfile.5
NetBSD tzfile.5

I am not sure that I have read everything correctly though.

[daurnimator]

Works for me:

luatz = require("luatz")

sydney_ts = luatz.time_in("Australia/Sydney")
sydney = luatz.timetable.new_from_timestamp(sydney_ts)

print(sydney)
print(os.date("!%c", math.floor(sydney_ts)))
os.execute("env TZ=Australia/Sydney date")

$ lua 17.lua
2023-03-21T13:19:30.597
Tue Mar 21 13:19:30 2023
Tue 21 Mar 2023 13:19:30 AEDT

Are you able to attach your tzfile?

[yorickhardy]

Thanks! Maybe I need to update by tz files ... I have attached the relevant file below.

…

On 2023-03-20, daurnimator wrote: Works for me: ```lua luatz = require("luatz") sydney_ts = luatz.time_in("Australia/Sydney") sydney = luatz.timetable.new_from_timestamp(sydney_ts) print(sydney) print(os.date("!%c", math.floor(sydney_ts))) os.execute("env TZ=Australia/Sydney date") ``` ``` $ lua 17.lua 2023-03-21T13:19:30.597 Tue Mar 21 13:19:30 2023 Tue 21 Mar 2023 13:19:30 AEDT ``` Are you able to attach your tzfile?

-- Kind regards, Yorick Hardy

[yorickhardy]

Oops, github does not seem to like the attachment. Let me try again (in a zip file).
sydney.zip