Winter Solstice is December 21, 2024 at 4:19AM Eastern. I want to mark it on my digital calendar, Fantastical. Since all the entries are based on events with a duration, there's no way to "bookmark" a specific moment in time and space. Even if I create an event that starts and ends at the same time, it still shows up on my calendar as something with a start and an end, when I really want it to appear like the "now" indicator:

Showing the daily agenda for 12/21/24, with the exact moment of Solstice rendered as an event between 4am and 5am.

Screenshot of Fantastical

The organizing principles of most calendaring software belong to the workplace. So many of the features and design decisions are made for people scheduling social conversations and sales calls. It's fun to recognize the needs that lay outside, trying to understand the ways of thinking made impossible by the design of the tool.