Timezone conversions

[Bram1903]

I will write the PR documentation later, as this is still a draft. I still need to go through the whole project for actually making sure that all the times are in UTC, but this PR allows us to both work on this PR.

[neozhu]

@Bram1903
see this:https://learn.microsoft.com/en-us/dotnet/api/system.datetime.touniversaltime?view=net-7.0
DateTime object has standard method
The ToUniversalTime() method is sometimes used to convert a local time to UTC. The ToLocalTime() method is then called to restore the original local time.

[Bram1903]

Technically we don't have to convert it back to local time in order for the library to convert it to the users timezone based on their browser information. As long as the library knows it's dealing with UTC it's fine, isn't it? The only reason it didn't work at first was because the library didn't know it was dealing with an UTC DateTime, which is why I specified that the given DateTime was of the kind UTC.

[neozhu]

@Bram1903
I think I can merge this PR into the main branch, right?

[Bram1903]

@Bram1903
I think I can merge this PR into the main branch, right?

I'm not certain if we finished moving everything from .now to .UtcNow. I haven't yet had the time to go over everything, but it shouldn't be an issue to merge it into main. I'm planning on taking another look later this week.

[neozhu]

done