Custom Timeperiods not working

I'm Using Nagios, version 1.0b4 and have created the following custom
timeperiod:

define timeperiod{
        timeperiod_name jx-as400
        alias           Jacksonville AS/400
        sunday          07:00-24:00
        monday          00:00-24:00
        tuesday         00:00-01:00,05:00-24:00
        wednesday       00:00-01:00,05:00-24:00
        thursday        00:00-01:00,05:00-24:00
        friday          00:00-01:00,05:00-24:00
        saturday        00:00-01:00,05:00-22:00
        }

I have approximately 10 services (across 2 hosts) set to use this time
period (both hosts and service definitions use the timeperiod); however, at
01:17 this morning we did receive a page even though, according to the time
period, we should not have.

Did I configure something wrong on the time period?

Thanks

Mike