Tax Year Prior to 2020: What do I report in date acquired for 1099-B?

[idealtrucks]

My wife worked for a company for many years with a monthly stock purchase plan, so stock was purchased every month.  She changed jobs, and I transferred these stocks from Computershare to Etrade, and then sold the entire lot soon thereafter.  The 1099-B I received from Etrade had 0 cost basis, and 1/1/1900 as the date acquired.    I have the correct cost basis that I've entered.  What do I enter for date acquired since it was many many dates.

[VictorW9]

As you're entering your Form 1099-B, there is a page that says "Now we'll walk you through entering the info on your *** 1099-B", mark the button with "Something other than a date" and select "Various".   See the screenshot below: