Guides to Browser Timing, Timezones, and Local Data

These are not generic articles about time. Each guide starts with a practical question, explains the relevant browser behavior, and then states what the current iLoveTimers implementation does. The guides also identify limits that cannot be removed by page code, such as a closed tab, device sleep, browser audio policy, or timezone data on the device.

1. Browser Timers in Background Tabs, Locked Phones, and Closed Tabs

   Understand what can happen to a browser timer when its tab is hidden, a phone is locked, the browser freezes the page, or the tab is closed.

   Direct question: Will a browser timer keep working in a background tab, on a locked phone, or after I close the tab?

2. Why a Browser Timer or Alarm May Stay Silent

   Troubleshoot browser timer and alarm sound, including autoplay rules, muted output, suspended audio, background pages, and device sleep.

   Direct question: Why did my browser timer finish without making a sound?

3. How Browser Timers Measure Elapsed Time and Handle Delays

   Learn why accurate browser timers measure elapsed or target time instead of assuming every callback arrives on schedule.

   Direct question: How can a browser timer stay accurate when animation frames and timer callbacks are delayed?

4. Unix Timestamps in Seconds, Milliseconds, and Microseconds

   Distinguish Unix timestamp seconds, milliseconds, and microseconds, recognize common digit lengths, and avoid 1,000-times unit errors.

   Direct question: Is this Unix timestamp in seconds, milliseconds, or microseconds?

5. Daylight-Saving Gaps, Repeated Times, and Timezone Conversions

   Understand nonexistent spring-forward times, repeated fall-back times, date-specific offsets, and how iLoveTimers resolves timezone input.

   Direct question: Why can a local time be nonexistent or occur twice during a timezone conversion?

6. What iLoveTimers Stores in Your Browser

   See which iLoveTimers preferences and tool data use local browser storage, what is session-only, and how clearing site data affects them.

   Direct question: What does iLoveTimers save in my browser, and what is not saved?

Implementation claims are traced to route components, shared hooks, formulas, storage keys, and automated tests in the production implementation. Browser behavior claims cite standards, browser vendor documentation, or reference documentation. Browser checks cover representative behavior, but they cannot prove identical behavior in every browser, operating system, power state, or permission setup.

For the broader review process, read How iLoveTimers Is Made. For site-wide data handling, read the Privacy Policy.