Add "today" as query option #3298

I want to add 2 queries:

• show new issues
• show issues closed today

Somethign similar to:

        {
            "label": "New Issues",
            "query": "state:open repo:${owner}/${repository} sort:created-desc closed:>=${yesterday}"
        },
        {
            "label": "Closed Issues",
            "query": "state:closed repo:${owner}/${repository} sort:created-desc closed:>=${today}"
        }

However, all the Github search documentation relates to setting a specific date.

Is something like this already available? I feel like this would be a variable handled by the extension.

Ideally, something like the below (php) psuedo code:

• ${today} => now()->format('Y-m-d')
• ${yesterday} => now()->subDay()->format('Y-m-d')

I would love to be able to do something like created:>=${yesderay}T18:00:00 => issues that were created after I left work.