I need a wordpress countdown that resets when finished.

Does anyone know any? Best regards.

The countdown must reset after it finishes to the beginning (infinite loop)

I found a few Countdown timer plugins for you (posted below), but I believe the Uji Countdown Timer ahs exactly what you're looking for as they just released a new featured called "Recurring Timer".

• Uji Timer: https://wordpress.org/plugins/uji-countdown/
• Widget Timer: https://wordpress.org/plugins/widget-countdown/
• CD Timer: https://wordpress.org/plugins/countdown-timer/installation/