It seems logical to me that if distance can't be divided into an infinite number of sections then neither should time. If the smallest possible distance is a planck length then it makes sense that the smallest moment of time, (a now), would be one planck time.
I think you will find Julian Barbour's work interesting. Make sure that you click on the interview at the bottom of the page.
Julian Barbour
Here is his own web site
Julian Barbour
Edited by GDR, : To add 2nd link
Everybody is entitled to my opinion.