need to divide a date

[nephish at xit.net]

Hey there,
i am doing a plotting application.
i am using mxRelativeDateTimeDiff to get how much time is between
date x and date y

now what i need to do is divide that time by 20 to get 20 even time
slots
for plotting on a graph.

For example, if the difference between them is 20 hours, i need 20
plots, each an hour apart. if its 40 minutes, i need 20 plots that are
2 minutes apart.

what would be a way i could pull this off?

thanks