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+======Synopsis:======
+[[on]] [#][<mode>]timer [<serial#>] [-|^]<match> { <action> }
+======Description:======
+This hook is triggered whenever the specified time (or time glob pattern)
+matches the current time.  The time may be in one of two formats:
+^Format             ^Description                                            ^
+|hh:mm<am%%|%%pm>   |0 <= hh <= 12, 0 <= mm <= 59, am or pm set accordingly |
+|hh:mm              |0 <= hh <= 23, 0 <= mm <= 59                           |
+======Parameters:======
+|$0 |current time (format depends on [[set CLOCK_24HOUR|CLOCK_24HOUR]] setting)|
+======Examples:======
+To inform the user of the time once per hour on the hour:
+   on ^timer "%:00*" {
+      xecho -b The time is now $Z
+      beep
+   }