JavaScript Date and timers
JavaScript Date, time, timers, and event loop timing
Learn JavaScript Date, time, and timers with focused lessons on Date objects, timestamps, date parsing, comparing dates, setTimeout, setInterval, scheduling, the event loop, macrotasks, microtasks, and animation timing.
Date, timer, and scheduling lessons
Date objects
Create Date values, read and set date parts, parse timestamps, and compare time-based data.
Outcome: Represent and compare dates in forms, records, logs, and API responses.
- JavaScript Date
- Date object
- timestamp JavaScript
setTimeout and setInterval
Schedule delayed and repeated work while avoiding runaway intervals and timing assumptions.
Outcome: Run code later or repeatedly with deliberate cleanup and control.
- setTimeout
- setInterval
- JavaScript timers
Event loop timing
Understand tasks, microtasks, rendering, and how promises and timers are ordered by the event loop.
Outcome: Predict ordering between synchronous code, promises, timers, and rendering.
- JavaScript event loop
- macrotasks
- microtasks
Promise microtasks
Study how promise reactions run as microtasks and why that affects timer and rendering order.
Outcome: Debug async ordering when promises and timers interact.
- JavaScript microtasks
- promise microtasks
- task queue
Page loading timing
Run browser code when DOM content, page assets, and unload lifecycle events are at the right stage.
Outcome: Start browser logic at the right time instead of racing the document.
- DOMContentLoaded
- load event
- page lifecycle
JavaScript animation timing
Connect JavaScript timing to animation loops, browser rendering, and practical motion updates.
Outcome: Choose timers or animation-friendly timing based on the browser workload.
- JavaScript animations
- animation timing
- requestAnimationFrame