I often use the "yyyymmdd" format for timestamps but the Microsoft FormatDateTime supports only available operating system formats and FormatNumber doesn't support left padding integers with zeros, so here's a little bit of code to get the date format that I want:
dtNow = Now strToday = Year(dtNow) & Right("0" & Month(dtNow), 2) & Right("0" & Day(dtNow), 2)
The dtNow stores the current date to avoid the date changing just after midnight. The Right("0" & Month(dtNow), 2) trick ensures that the output always has two digits. I think I first saw this idiom here: VBScript How can I Format Date?.