VBA code to set date format for a specific column as “yyyy-mm-dd”

I have a macro which I specify the date (in mm/dd/yyyy) in a textbox and I want to set this value for column A in yyyy-mm-dd format. I have the following code:

Sheets("Sheet1").Range("A2", "A50000").Value = TextBox3.Value
Sheet1.Range("A2", "A50000") = Format(Date, "yyyy-mm-dd")

...and when I run the macro, the date is still in mm/dd/yyyy format.

How can I change this so that it is in the format I want?? I've been trying many kinds of code researched through google and nothing will set the format the way I want it.

Any help will be appreciated...

EDIT: Full code from OP's comment below:

 Range("A1") = "Acctdate"
 Range("B1") = "Ledger"
 Range("C1") = "CY"
 Range("D1") = "BusinessUnit"
 Range("E1") = "OperatingUnit"
 Range("F1") = "LOB"
 Range("G1") = "Account"
 Range("H1") = "TreatyCode"
 Range("I1") = "Amount"
 Range("J1") = "TransactionCurrency"
 Range("K1") = "USDEquivalentAmount"
 Range("L1") = "KeyCol"
 Sheets("Sheet1").Range("A2", "A50000").Value = TextBox3.Value
 Sheet1.Range("A2", "A50000").NumberFormat = "yyyy-mm-dd"


Use the range's NumberFormat property to force the format of the range like this:

Sheet1.Range("A2", "A50000").NumberFormat = "yyyy-mm-dd"

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