Query or filter the data when using date time format

Googlesheet: https://docs.google.com/spreadsheets/d/1hO_KatnkP58wuF6I7kwtlGgCI6xM6ubopgCwuYMXXIU/edit?usp=sharing

Sheet2

In cell A2 I have:
=QUERY(Sheet1!A1:Q, “Select * where B >= datetime ‘”&TEXT($A$1,”MM-DD-YYYY HH:mm:ss”)&”‘”)

In cell A1 I have:
6/17/2020 10:53:22 AM

Sheet1:
Column A (user) and B (date and time)
User1 6/17/2020 10:53:22 AM
User2 6/17/2020 10:53:22 AM
User3 6/17/2020 11:10:55 AM
User4 6/17/2020 11:33:57 AM
User5 6/24/2020 10:47:34 AM
User6 6/25/2020 4:50:39 AM
User7 6/24/2020 4:00:24 AM
User8 7/4/2020 5:44:25 AM
User9 7/4/2020 7:08:29 AM
User10 7/4/2020 8:49:24 AM
User11 7/3/2020 7:36:46 AM

The expected output in A2 Sheet2 is:
User1 6/17/2020 10:53:22 AM
User2 6/17/2020 10:53:22 AM

but the query I used outputs all of the data from Sheet 1.

Hope someone can help me…

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Author: KB John