"ppp -auto" limited to certain times only?

[Ben Cohen]

Hi,

I have fixed-rate dialup access from my ISP but only off-peak.  I just
found out that they let me connect at other times but charge me extra so I
want to avoid doing this accidentally.

I'd like to run "ppp -auto" so that I get dial on demand in the evening,
but stop it connecting in the daytime.  I thought of using a cron job to
start and stop ppp but is there a more elegant way?

Thanks,
Ben.