Adds timezone to ltt time helper

[colindean]

This might help folks outside of CET get the time right.

The TZ is in the title on the link but someone might not think to look at that.

N.b. I'm making this edit in GitHub so I've not verified that it looks right.

[johanvdw]

Thanks for your help.
This gets quite large, wonder if there is a nicer method.

[colindean]

Another strategy could be to plaster everywhere that all times everywhere on the site are CET. I'm not sure how many places would have to change, though, so modifying the very function that renders the time seemed more appropriate but I will concede that it is probably overkill.

[boegel]

I strongly support this proposal.

With FOSDEM'22 being fully online again, I think it's very important to make it crystal clear that all times mentioned on the website are in Brussels time (CET).

Maybe the width of the Start and End columns should be increased slightly to avoid line-wrapping of the time + CET?

[kergon]

I don't want it everywhere like that. There's no shortcut to doing a change like this properly.

[boegel]

How about a line (in bold) like "All times are in CET (UTC+1) time zone" on top of the Event table (or next both to Saturday and Sunday)?

[kergon]

By properly I mean a complete review of the website, looking at all the places where a time is shown, categorising the different types of cases found, and then deciding how best to remove the current ambiguity - if possible, even letting the viewer specify their preferred timezone. Different pages might need different solutions - until someone's worked through it all I don't know.