Recently I’ve had a few calls about rate cards in A2Billing not working as expected. Everything looked good except the expiry date on the rate card was showing as 0000-00-00 00:00. This caused the rates in that rate card not to be evaluated as part of the call plan.
It looks like this is caused by a limitation in 32 bit Linux with the last date able to be represented as 19 January 2038. See here for more information about this – http://en.wikipedia.org/wiki/Year_2038_problem
When you create a new rate card, A2Billing tries to add 25 years to the current date to generate the expiry date for the rate card. Since 19 January 2013 this would have taken it past the last valid date in 32 bit Linux – causing the 0000-00-00 00:00