Re: Tip regarding changing dates.
The simple task changing the date for a "record" usually involves an inordinate amount of effort. It involves changing the date in at least three places and potentially moving occurrences around so that they sit under a sample of the correct date. So, instead of changing the date in all of these places, I usually create a new record with the correct information and either invalidate or delete the incorrect record. This is actually much easier than fiddling around changing dates where there is the potential to forget to change one and thus create invalid data.
Charles
Digital Development Manager | Field Studies Council
http://www.field-studies-council.org | https://twitter.com/charlesroper | https://twitter.com/fsc_digital