If you want to promote special offers than you need this module.

Flexible and and easy to use, this feature provide a countdowntimer

Boost your sales by creating urgency.
Countdown timer is one of the essential extension that you can have in your online store. When the timer ticks, shoppers get the fear of missing out the deal and tend to buy the products.

Can be used for
1. Flash sales
2. Special day sales (Black Friday, Cyber Monday, Mother's day, New year)
3. Seasonal sales (Christmas)
4. Limited time promotions
5. Clearance sales
6. Daily deals
7. Increase conversion rate

Features
1. This module is used to display Live Timer for special products
2. Display in Product page, Category page, Search page, Special module, Featured module and Latest module.
3. Display Day, Hour, Minute, seconds for expire Special Offer.
4. No OpenCart core files overwritten
Compatibility v2.0.1.1- v2.2.0.0
Version1.0.5 (06/16/2016)

Compatibility v3.X
Version1.0.6 (06/23/2020)

Support
Email: kcsy2009@163.com
6-months of free support and upgrades period

How to install it please refer to this article:
http://docs.opencart.com/en-gb/extension/modifications/

How to use it:
1. Please log in to the shop administrator backend.
2.Go to Catalog -> Product -> Edit Product, and click on the special tab.
3.Set the product special price, date start and date end.
4.You'll see the countdown effect of the discount on the product listing page and the product detail page.

Demo here: https://oc.cutenessadd.com/