Rule for date

Here’s one way of doing it.

Basically you grab the hour component from your date/time control and check to see if it’s earlier than 8 or after 16.  If it’s 16 you also need to check the minutes are not more than 0.

For ease of readability I’ve split it into 3 form variables.

Create an integer form variable called “Hour”:

convertToNumber(formatDate([Form].[Datetime],"HH"))

Create an integer form variable called “Minutes”:

convertToNumber(formatDate([Form].[Datetime],"mm"))

Create a boolean form variable called “Outside work hours”:

ifElse([Form].[Hour]<8||[Form].[Hour]>16,

    true,

ifElse([Form].[Hour]==16&&[Form].[Minutes]>0,

    true,

false))

Now you can write a submit rule: