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<concept id="GUID-66402932-5C44-556B-A7AC-1C2D245C8B05" xml:lang="en"><title>Clocks and Timers Tutorial</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>You can use the clock and timer APIs to schedule tasks that require sub-second granularity. When a timer expires it can send a signal to its calling process. </p> <p>The following topics describe how you can use the clock and timer APIs when you develop POSIX compliant applications or port POSIX-based applications to Symbian platform. </p> </conbody></concept>