How are others handling Adjustments via the API?

Does anyone have insight on how to handle adjustments coming in via the gift API? We're trying to determine if we're doing something wrong in how we're reading/processing or if there's an issue with the API itself. What we're seeing is, if gift with type Adjustment comes in, the date on it is now, with the corrected info i.e. amount, fund or something else changed. We do calculations based on aggregate info. If we exclude Adjustments and count the original gift in our calcs, then we're using the old info which is now incorrect. If we include Adjustments, there doesn't seem to be a way to link the two so that we can exclude the original gift and only count the corrected info. which we would need to do otherwise we'd be double counting. And if there is a way to exclude the original, the date on the Adjustment is now not the original gift date which doesn't work for things like gifts given in a certain timeframe. We'd have to link them and use most of the info from the Adjustment but refer to the date from the original gift.