is it possible to insert a voucher code for a period of time? For ex. until 31.01.18, after this time, the voucher should be deactivated, but the item should be active! Is there a option for the k2 fields?

Hope you have a idea.

Thanks in advance

Hello,

By default this functionality is not available.
You can search for an extension in the JED or you can look at an ecommerce solution like K2Store