I was wondering how can I find out if there's a conflict on date and time

I have a program written for a local auction house where it allows them to track when there drivers were parking cars (hourly) or going on trips (flat rate). The person who enters the record does so later so she would need to enter the times that they did what. What they're concerned with is someone making a mistake and entering a record for 02:00 to 04:00 and another for 03:00 to 05:00 and having them get paid for 4 hours when it's really 3. So they wanted me to make sure they didn't get double billed. I decided to make it so duplicates can't be entered but I'm wondering how would I write it so if a period exists between the fromDate/fromTime and toDate/toTime I would know?

Convert the dates to seconds since the Epoch with http://java.sun.com/j2se/1.4.2/docs/api/java/util/Date.html#getTime() and check for overlapping intervals.
Harald.
Java Text Crunching: http://www.ebi.ac.uk/Rebholz-srv/whatizit/software

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