Graphs with minutes use 12 hour format

[MarcelWaldvogel]

Expected behavior

All times on the graphs are given in 24 hour format, based on UTC.

Actual behavior

When minutes are displayed, the hours are shown in 12 hour format (without AM/PM). Everything else is correct.

How to reproduce

1. Log in to the test system
2. Add a new host to the pool between 13:00 and 22:00 UTC ("monitoring only" status is also OK)
3. Wait 1-2 hours
4. Look at the graph in the "account" view (see screenshot below). The graph shows hours-only marks (HH format) correctly (24 hour format), but the HH:MM formatted times between that use 12-hour format, resulting in e.g. the sequence "8:45", "21", "9:15", ….

I have not verified whether this also occurs in the production system and/or the individual host view. (The screenshot is from the "account" view in the test system.)

BTW: It would be a bonus for the sequence afterwards to not read "20:45", "21", "21:15", but "20:45", "21", "21:15" instead (notice the "21:00"), for consistency.