This is big news for web developers because working with dates and times in JavaScript will be hugely simplified and modernized.
Temporal is designed as a full replacement for the
Date
object, making date and time management reliable and predictable. Temporal adds support for time zone and calendar representations, many built-in methods for conversions, comparisons and computations, formatting, and more.
Over 200 utility methods! (Good blog post from Iago Lastra.)
To help you get up to speed, there are over 270 pages of Temporal docs on MDN added this week, with detailed explanations and examples.
Coming when? I can’t tell you, but I do find it notable that there are experimental implementations already and that all three (Firefox/Safari/Chrome) are actively working on it.