How to change Availability Date Default?

[florioro]

Hello,

I use 2.5.8 Joomla with 2.0.14 Virtuemart.

Please tell me where I can change default value -Never- to Availability Date?

Unfortunately I must import 10000 products and after import I don't have setup for Availability Date. To make this products usable I must edit every product to insert the Availability Date.

Please help me to change Availability Date for bulk products or just change default Availability Date -Never- to some date!