Wrong Timezone

[sebastienserre]

The problem

Europe/Paris is GMT+1 in winter and GMT+2 in summer.
Currently, the correct Timezone is GMT+2 but in Home Assistant > Settings > System > General, the TZ is GMT+1

What version of Home Assistant Core has the issue?

core-2025.6.1

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

IDK

Anything in the logs that might be useful for us?

As a result calendar integration are not showing the correct hour...

[sebastienserre]

Is #145101 related ?

[Petro31]

The +1/+2 changes are handled by DST in python, so the selection in the dropdown will not display the current offset, it displays the offset without DST.

Is #145101 related ?

No

[sebastienserre]

Does it mean the issue is from HA Core?

[Petro31]

Does it mean the issue is from HA Core?

What issue? All you've shown is that the picker says +1. Is there actually something wrong here?

When I choose paris as the timezone, the clock in HA is correct.

[sebastienserre]

official time in Paris is GMT+2 and the results of the now() function is showing it (+02:00):

2025-06-18 20:50:00.475715+02:00

[Petro31]

official time in Paris is GMT+2 and the results of the now() function is showing it (+02:00):

2025-06-18 20:50:00.475715+02:00

Right, so what's the bug?

You select Paris as the timezone and it gives you the proper time throughout the year. +1 without DST (winter) and +2 with DST (summer).

[sebastienserre]

The select says GMT+1

[Petro31]

The picker says the timezone without daylight savings time, which is +1, so that's what it will always be.