Parse datestamp in both WorldPay audit file formats

Change-Id: Icf12186ae85fa5e003328c15a655bdd57f3f1336
Merge remote-tracking branch 'origin/master' into HEAD

6735280f9a68e02583961999f897a6328200fd42 Parse datestamp in both WorldPay audit file formats

Change-Id: I78d0441e4af5a1a5513f4e5d7ce901d017c06abf