Date presentation is not consistent

[pahjbo]

dates are sometimes shown with timezones and other times not - in addition there is a lack of timezone consistency as there are hour differences presumably because in some areas the dates are being treated as BST and others not. To fully solve this there will need

• to have the front end presentation made consistent, which is probably best solved by have unified method for dealing with date conversions #72
• to upgrade the underlying data model code to use the Java8 date/time api that has timezones integrated use java.time.* data/time api classes for dates and times in generated java ivoa/vo-dml#49

[pahjbo]

for the foreseeable future the API will not be changed (ivoa/vo-dml#49) so that the pre-Java 8 java.util.Date class (which does not have any timezone representation) - however all times should be assumed to be UTC (and the UI should say this) - so it means that there needs to be consistency in the frontend - see also #220

[Republicof1]

this is a reported but seemingly not addressed issue in dayjs as used by mantine. The problem was first reported dec 2020 with the latest comment being last month saying that it remains unfixed

iamkun/dayjs#1260

I will continue to attempt to solve until the end of today. I'm looking for a work around that solves for UTC