Nintex rule to find the difference between time selected in dropdowns

I have two dropdowns in which i put time options to select

for eg:

From 09:30 and To 11:45

I need to validate the selected To time should be greater than From time.

The dropdowns contains options from 00:00........23:59

Can anyone help me to set a rule for validation.

NB: I am using nintex responsive forms in which we can not add any custome javascript.

+23

Could you use a validation rule such as greaterThan(value1, value2) which returns true if value 2 is greater than Value 1?

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