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replied on February 5, 2014
This is possible, but since the WebLink Search Form Designer currently doesn't support the use of date tokens, the user would have to manually enter in the current date.
You can create a custom variable (i.e. called "TimeFrame") using a single select list type for "before", "on", and "after". Next, create another custom variable (i.e. called "Date") and give it the "Date" input type.
Now for your search query, just create multiple custom constraints for:
{[template]:[field]<%(Date)} with the condition of TimeFrame is set to value "Before"
{[template]:[field]=%(Date)} with the condition of TimeFrame is set to value "On"
{[template]:[field]>%(Date)} with the condition of TimeFrame is set to value "After"