WorldServer - What is the syntax in Freeform SQL to search for a date range?

What is the syntax in Freeform SQL to search for a date range?  I've tried a lot of variations of this code, but to no avail:

[Created on] > '2020-01-01'
or
[Created on] < '2020-01-01'

Use:

[Created On] > {1/1/2020}

or

[Created On] < {1/1/2020}

You have to put the date in curly braces for WorldServer to recognize that it’s a date and treat it accordingly. another example:

[Created On] between  {2/16/21} and {2/20/21}

This article provides more information about how to use Freeform SQL:

WorldServer - How to use Freeform SQL in WorldServer to look up Translation Memory Units?

This article is relevant:

WorldServer - How to use Freeform SQL in WorldServer to look up Translation Memory Units?