i. Go to Woocommerce > Woo Discount Rules > Cart Discount Rules tab and click Add New Rule button.

ii. Fill the following fields
Order = 1
Rule name = Date and Time based discount on product price
Rule Description = Date and Time based discount on product price
Validity = 12/01/2017 - 31/01/2017

iii. Save Rule and Move to Condition tab

iv. Type - Count of cart items at least
     Value - 2

v. Save Rule and move to Discount tab

vi. Discount type - Percentage
     Discount Value - 20

vii. Save Rule and check in frontend. See the screen shot below

Did this answer your question?