Option to represent date-times in long ISO format

[MetRonnie]

Describe exactly what you would like to see in an upcoming release

We should consider displaying date-times in the long ISO format in the UI, even if the cycle point format of a workflow is the short format, as it will make cycle points easier to read. I.e. 2000-01-01T00:00Z instead of 20000101T0000Z.

This could be an option in settings.

Pull requests welcome!

[hjoliver]

Agreed, that would be nice. Although it might be a little dangerous, if it leads users to use the wrong datetime format on the command line? (maybe we can automatically convert to the workflow format... I think we do that already for cylc suite-state xtriggers).

[MetRonnie]

I don't think it matters what users use on the command line? According to the docs

The time zone you specify here will be used only for writing/dumping cycle points

[hjoliver]

I don't think it matters what users use on the command line? According to the docs

The time zone you specify here will be used only for writing/dumping cycle points

I mean the whole datetime format, not just the timezone.

E.g. for a monthly-cycling workflow with this:

cycle point format = %Y-%m

The CLI has to use the same format as the scheduler because no conversion is done. If wf//2025-01/foo is running:

$ cylc kill wf//2025-01/foo  # OK
$ cylc kill wf//202501/foo  # ERROR (task not found)

[MetRonnie]

Argh, clearly I needed more coffee yesterday ☕

[MetRonnie]

Since cylc/cylc-flow#4881 the CLI no longer has to be given the same format as the workflow cycle point format

[MetRonnie]

Just had a thought about this the other day. Potentially we could do a similar thing to i18n and have a function we call on every cycle point displayed in all vue templates, like

cylc-ui/src/components/cylc/workspace/Toolbar.vue

Lines 155 to 157 in afb1500

	<span class="label">
	{{ $t('Toolbar.addView') }}
	</span>

Maybe something like

<span>{{ $c(node.cycle) }}</span>

const displayLongCyclePoints: Boolean = useLocalStorage(...)

function $c (cycle: string) {
  return displayLongCyclePoints ? formatLong(cycle) : cycle
}