Timer

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Use a simple and convenient Countdown Timer online and for free

  1. Online timer with alarm, free to use and easy to share.
  2. When timer comes to zero minutes, zero seconds and zero milliseconds, alarm will start ringing. Press the 'stop' button and alarm will stop. If you want to start again and set timer for 10 minutes or set alarm for 10 minutes, just press the 'reset' button. In 'timer settings' you can change the time for timer.
Hours

123Timer is a simple, convenient, and free online timer. With it, you can track time directly on the site without installing additional applications. Our countdown timer will be useful in many cases: for.

Minutes
TimerMinutes
Seconds
Minutes
Please select a Timer period

About 123Timer

123Timer is a simple, convenient, and free online timer. With it, you can track time directly on the site without installing additional applications. Our countdown timer will be useful in many cases: for example, if you like to play online games and you need to track time, as well as during sports activities, cooking, and many other cases. You just need to set the time and press the «Start» button, now be sure that 123Timer will notify you with an accuracy of milliseconds.
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Day timer

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Hour timer

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Minute timer

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Second timer

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A facility for threads to schedule tasks for future execution in a background thread. Tasks may be scheduled for one-time execution, or for repeated execution at regular intervals.

Corresponding to each Timer object is a single background thread that is used to execute all of the timer's tasks, sequentially. Timer tasks should complete quickly. If a timer task takes excessive time to complete, it 'hogs' the timer's task execution thread. This can, in turn, delay the execution of subsequent tasks, which may 'bunch up' and execute in rapid succession when (and if) the offending task finally completes.

After the last live reference to a Timer object goes away and all outstanding tasks have completed execution, the timer's task execution thread terminates gracefully (and becomes subject to garbage collection). However, this can take arbitrarily long to occur. By default, the task execution thread does not run as a daemon thread, so it is capable of keeping an application from terminating. If a caller wants to terminate a timer's task execution thread rapidly, the caller should invoke the timer's cancel method.

If the timer's task execution thread terminates unexpectedly, for example, because its stop method is invoked, any further attempt to schedule a task on the timer will result in an IllegalStateException, as if the timer's cancel method had been invoked.

Timer For 20 Minutes

This class is thread-safe: multiple threads can share a single Timer object without the need for external synchronization.

This class does not offer real-time guarantees: it schedules tasks using the Object.wait(long) method.

Java 5.0 introduced the java.util.concurrent package and one of the concurrency utilities therein is the ScheduledThreadPoolExecutor which is a thread pool for repeatedly executing tasks at a given rate or delay. It is effectively a more versatile replacement for the Timer/TimerTask combination, as it allows multiple service threads, accepts various time units, and doesn't require subclassing TimerTask (just implement Runnable). Configuring ScheduledThreadPoolExecutor with one thread makes it equivalent to Timer.

Timer

Implementation note: This class scales to large numbers of concurrently scheduled tasks (thousands should present no problem). Internally, it uses a binary heap to represent its task queue, so the cost to schedule a task is O(log n), where n is the number of concurrently scheduled tasks.

Google Timer

Implementation note: All constructors start a timer thread.