Timezone global configuration problem

Hi everyone,

I have the impression that the timezone global configuration documentation is not accurate - or is causing to render wrong offset times in Jekyll.

I tried several combinations, for page frontmatter “date: …”, and _config.yml timezone: ...".
Each time rebuilding the site and none give a reassuring result rendering the correct date in the page.


I built my jekyll site locally on a mac running in the default timezone “Europe/Brussels”.

Just to be sure, I configure _config.yml and set

timezone: Europe/Brussels

The docs say it has to be the IANA term “Europe/Brussels”.

So DST (Daylight Savings Time) is not active and my clock is +0100 offset from UTC.
A page has a date frontmatter value:

date: 2023-02-05 10:30:00

The time rendered on the page is one hour later: 11:30

OK. The documentation for page.date states it assumes UTC. So 10:30 + 1 hour = 11:30 My bad. so I change page.date to:

date: 2023-02-05 10:30:00 +0100

The time rendered on the page is correct: 10:30

But here comes my problem: If the date is not in Februari but in Juli,

date: 2023-07-05 10:30:00 +0100

The time rendered on the page is wrong: 11:30
So I need to know whether Daylight Savings is active on a particular date, or not, and set page date with offset +0200 or +0100 instead!

So I fix it and set page.date to:

date: 2023-07-05 10:30:00 +0200

The time rendered on the page is now correct again: 10:30

Now what do I have to do to render the correct local time given February or July without having to know which date DST comes into effect?


Specify the page.date time zone using a IANA term “Europe/Brussels” and not as an offset as mentioned in the “variables” chapter of the Jekyll docs. page.date becomes then:

date: 2023-02-05 10:30:00 Europe/Brussels # February

… or …

date: 2023-07-05 10:30:00 Europe/Brussels # July

Both are rendered correctly now as 10:30 for a date in February or July.

“Europe/Brussels” causes the logic to take DST into account rendering the time - but only for page.date values - NOT as one would expect, because of the timezone in _config.yml :

timezone: Europe/Brussels


The solution is undocumented, but tested - but I don’t know why it works.

A problem that goes away with no good reason will come back with no good reason?.

Stefaan Huysentruyt

Hello @hazzanizza,
Thank you for sharing this observation with the community.
This looks like bug somewhere. If you have the time, I request you to file a bug report at Jekyll’s GitHub repository:

Thank you, please could you review my issue #9278 for any confusing terms?


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