What format are the timestamps in?

Convert the timestamps to seconds (use any means neccessary).

Create a datastructure resembling 

$foo{'bar'} = [
   1, # first joined
   2, # left
   3, # joined again
   4, # left
   5, # joined again
];

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If a user has an odd number of timestamps, he's still a member.

It's fairly obviouls how to go about querying for other values.

If the code is clean, switching to DBI needn't take more than a few days (i got a feeling its not though *shudder*).

In reply to Re: Re: Re: Multiple date ranges by Anonymous Monk
in thread Multiple date ranges by AndyH

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