Per IRS Instructions for Form 8949, page 5:

Stock acquired on various dates. If you sold a block of stock (or similar property) that you acquired through several different purchases, you may report the sale on one row and enter “VARIOUS” in column (b). However, you still must report the short-term gain or (loss) on the sale on Part I and the long-term gain or (loss) on Part II.

The TaxAct program allows you to enter "Various" as the date acquired on Form 1099-B.

To report your Form 1099-B and enter "Various" as the date acquired (if you need help reporting your Form 1099-B in the TaxAct program, go to our Form 1099-B - Entering into TaxAct FAQ):

1. From within your Form 1099-B, on the screen titled Investment Sales - Transaction Details, click the field below 1b. Date acquired, and type "Various".

Note that any link in the information above is updated each year automatically and will take you to the most recent version of the webpage or document at the time it is accessed.