liminfoCountdown Timer
Free web tool: Countdown Timer
00
Days
13
Hours
00
Min
28
Sec
Detailed Conversion
About Countdown Timer
The Countdown Timer displays a live, second-by-second countdown to any target date and time you set. Enter an optional event name (such as "New Year", "Exam Day", or "Wedding") and select the target date and time using a datetime picker. The timer immediately shows the remaining time broken down into days, hours, minutes, and seconds, with large numerals that update every second in real time.
Beyond the primary countdown display, the tool also provides a detailed conversion panel showing the total time remaining expressed as total hours, total minutes, and total seconds. This is useful for scheduling, event planning, and awareness of exactly how much time is left. When the target time has passed, the timer automatically switches to elapsed mode, showing how much time has gone by since the target.
All processing runs entirely in the browser using JavaScript's setInterval at 1-second intervals. The datetime-local input allows selecting any future or past date down to the minute. The tool is bilingual (Korean and English) and fully supports dark mode. No data is stored or transmitted — it is completely private and works offline once the page is loaded.
Key Features
- Live second-by-second countdown updating every 1000ms using setInterval
- Accepts any target date and time down to the minute via datetime-local input
- Optional event name field displayed above the timer blocks
- Four large countdown blocks: Days, Hours, Minutes, Seconds with zero-padded display
- Detailed conversion panel: total hours, total minutes, total seconds remaining
- Automatically switches to elapsed mode when target time has passed
- Bilingual Korean/English interface with dark mode support
- 100% client-side — no data stored or transmitted, works offline after page load
Frequently Asked Questions
How do I set up the countdown timer?
Enter an optional event name (e.g. "New Year 2027") in the first field, then click the datetime input to select your target date and time. The countdown starts immediately after you set a date. The timer displays days, hours, minutes, and seconds, all updating every second.
Can I count down to a specific time on a specific date?
Yes. The input uses a datetime-local format that lets you specify both the date and the time down to the minute. For example, you can set it to December 31 at 23:59 for a New Year countdown, or to 09:00 on a specific exam day.
What happens when the countdown reaches zero?
When the target time passes, the display automatically switches to elapsed mode, showing how much time has gone by since the target moment. A message appears indicating that the target time has passed. The counter continues running, now counting upward.
Does the timer keep running if I switch tabs?
Yes. The timer uses JavaScript setInterval running in the browser, and most modern browsers continue running background tabs normally. However, some browsers may throttle background timers to save battery, which could cause occasional minor display lag. Switching back to the tab will correct any drift.
What does the "total hours/minutes/seconds" section show?
The detailed conversion panel at the bottom shows the total remaining time expressed in a single unit each: total hours (e.g. 8,760 hours to a date one year away), total minutes, and total seconds. This is useful for understanding the full magnitude of remaining time without the day/hour/minute breakdown.
Can I use this for multiple countdowns at once?
This tool supports one countdown at a time. To track multiple events simultaneously, you can open the page in multiple browser tabs, each set to a different target date. Each tab runs independently in your browser.
Does the countdown work on mobile devices?
Yes. The timer is fully responsive and works on smartphones and tablets. The large numeral blocks scale appropriately for smaller screens. The datetime picker uses the device's native date/time selection interface on mobile.
Is the countdown accurate?
The timer updates every second using JavaScript setInterval. It calculates the difference between the current time (checked each second) and the target time using Date object millisecond arithmetic. The accuracy is within 1 second and does not drift over time because each tick recalculates from the current system clock.