I have recently been in reciept of an e-mail or two questioning my motives for making blog postings in the past. My reasons for this are simple; I want to ensure that events I blog about are posted in the order in which they happen, however the time I have available to me to write blogs is often quite varied and so means I have to set the time stamp of some of my postings to be in the past in order that they fit inbetween the rest of my posts accordingly.
In terms of how I choose the time and date stamp, I try to pick the date and time such that if the time had have been available to me at the time, that is when I would have written and posted that particular blog. Hope this helps some confused readers! 🙂