Timezone America/Monterrey not properly updated to UTC-5

[perlucas]

Environment

Run on Mac OS Monterey v12.5.1

{
  moment: '2.29.4',
  momentTz: '0.5.43',
  date: 'Mon Apr 10 2023 16:43:17 GMT-0300 (Argentina Standard Time)',
  intlZone: 'America/Buenos_Aires'
}

Issue description

On April 2nd, the "America/Monterrey" timezone shifted from UTC-6 to UTC-5, but running the code below still gives me 8:00 AM. It should be 9:00 AM.

moment("2023-04-04T14:00:00.000Z").tz("America/Monterrey").format('h:mm A')

[aldinicontini]

Yes, same issue

[gilmoreorless]

On April 2nd, the "America/Monterrey" timezone shifted from UTC-6 to UTC-5

Last year, Mexico got rid of daylight saving time in most (but not all) states/regions. https://www.timeanddate.com/news/time/mexico-abolishes-dst-2022.html
Only some of the towns right on the border with USA will continue with DST. Monterrey is not one of those towns, so it is on UTC-6 all year round: https://www.timeanddate.com/time/change/mexico/monterrey
Therefore, this code is correct.

[mauricio-testa]

Mexico time is also wrong

[gilmoreorless]

@mauricio-testa That screenshot doesn't really tell me anything. You could be running a completely different version of moment-timezone from the opening post in this issue — one that's older and doesn't have the updated zone rules. Running that same code in the console on https://momentjs.com gives the correct offset of -06:00.

[AlejandroAlt]

@perlucas did you solve it? I have a similar problem with America/Mexico_City.

[BilalTariq01]

@AlejandroAlt Latest release (0.5.43) has updated America/Mexico_City timezone

[mexchip]

The minimum required version for the America/Mexico_City DST update is 0.5.39.