Based on your request it sounds like you are trying to retrieve the "modification history" events of an object (which is what content=history returns, as opposed to the sensor channel history data).
To filter for all modification history events greater than a specified date (e.g 2/2/17) you would do
Where 42767.5416666667 is the OA DateTime representation of 2/2/17. Depending on the programming language you're using, you may or may not have difficulty creating such a value in the first place.
Alternatively, as Stephan says, you can use PrtgAPI. In this instance, you would want to use the Get-ModificationHistory cmdlet. While this cmdlet does not specify filtering by date server side, you can still filter by date client side
# Get all modification events on the object with ID 1001 since this time yesterday
Get-ModificationHistory -Id 1001 | where DateTime -gt (get-date).adddays(-1)