I do like your optimism but most of modern communication isn’t done via meeting invites from Google / MS Office.
I might say to someone on Slack: are you free at 14:00 UK time? Or organise a time on a Zoom call.
Because so much of modern technology is already soulless, I’d hate to see a future where the only practical way to organise some time with someone becomes via business productivity suites.
In Discord you have Time tags for things like like "Are you free at <t:unixtimestamp>?". There's a well known tool called Hammertime [1] to make it easy to create those tags and copy/paste them into place.
(I miss Hammertime sometimes daily when using Slack at work.)
We could standardize such tools. We could make them easier to use like <mylocaltime:14:00> or <mylocaltime:3/2 2pm>. We have the technology (decades of date parsing experience and date math libraries).
Will we? Probably not. Unless we did something wild like move to 15-minute timezones and force ourselves to.
[1] https://hammertime.cyou