CTAN web interface: package cntdwn

The package provides three sets of timers:

A short countdown (or count up) to an event. (Short being defined as less than a day.) The short countdown is designed for talks or presentations. There are three notification times, to announce to the speaker and audience that time is running out;
A long countdown to an event in the (distant) future. There are three notifications up to the main event (when counter reaches 0 seconds), and three notifications following 0 seconds;
Clock counters. The package allows you to create a clocks that display time and date. Clocks can show local time or time in any foreign time zone.

If possible, get this package from your distribution using its installation manager. (For installation help, click on your distribution's name.)

Distribution	Package name
MiKTeX	cntdwn
TeX Live	-this package is not in TeX Live-

You can also visit cntdwn's CTAN directory to browse the source or download the material for installation by hand.

Package cntdwn:

Support for countdowns, and for clocks in any timezone.