@imkmfhttps://github.com/Foundry376/Ma... - it's really hard to find email client for Windows that is fast and has uncluttered and clean UI. Fortunately, there's Mailspring. It was once called "Nylas", but after some changes to company, the cofounder(?) of Nylas forked it as a Mailspring.
To be honest, I have discovered it more than a month ago. But it had some blocking bugs at the time. Now after several updates, I've recently checked it and it works pretty great and I've switched to it from Postbox (which is also good alternative, but it's kinda slown when you have lots of emails, and the UI isn't as good Mailspring's).
@imkmfhttps://github.com/xx45/dayjs Date and Time look so non trivial at first but they are one of the major pain in the A most of the time when you start adding a lot of users from various countries and localization's.