Consider changing default timezone to UTC

[martin-ballhatchet-moj]

hmpps-template-kotlin/Dockerfile

Line 20 in c630c83

ENV TZ=Europe/London

This may cause (has caused) issues where the local time changes and an hour goes missing or an hour repeats itself. Many such issues will be picked up by good code checking the "zone" of the time it is being passed, but not all.

[sldblog]

Has this been discussed yet?

Edit: My primary concern is making sure the resulting images have the timezone correctly set. I had a couple of instances in MoJ where it looked like it was set to Europe/London in the Dockerfile but was in fact UTC. Of course, if all time would be timezone-aware, that wouldn't be a problem 😁

I like the "convert to local time on display" principle: if the service is doing that on the server-side, that's I think either

1. configuration for the app, which aligns with 12-factor principles
2. or runtime via the container timezone (we don't have any multi-region deployments, so not a big deal)

[martin-ballhatchet-moj]

Nope, no discussion that I've been part of.

[sldblog]

Where would we put an HMPPS-wide ADR (proposal) like this? 😁

I'm happy to write one with defaulting to UTC (with "make the days after the last Sunday in March and last Sunday in October free" joke suggestion 😛)