how to auto restart a countdown timer

Ive managed to follow instructions from a website to create a countdown timer which is very simular to this one: ( What i cant get it to do is automatically reset. ive tried various different ways but to no success. ive got 3 timers on a page all counting down to zero:

  1. counts down to 8:00pm each day.
  2. counts down to 8:15pm each Wednesday.
  3. counts down to 8:30pm on the 1st of each month. any ideas on how i can do this? cheers in advance.

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