Query not producing expected result

[Chuck Martin <clmartin@xxxxxxxxxxxxxxxx>]

I need help figuring out why a query is not returning the records I expect it to. I'm searching on a DateTime column (timestamp without time zone - not nullable). The query includes:

 AND event.Primaryresp_fkey = 5000011 AND event.DateTime <= 'May-1-2019'  AND event.EventDone < 1

This does not return a record that has a DateTime value "May 1, 2019 9:52 AM". If I modify the query to:

 AND event.Primaryresp_fkey = 5000011 AND event.DateTime <= 'May-2-2019'  AND event.EventDone < 1

it does return the record in question. I assume I am not doing the data comparison correctly, but don't know why. 

Chuck Martin

Avondale Software