ZF-2618: Timestamp format an timezone through Zend_Date
At the moment the format and the timezone of the timestamp in the log is hardcoded (date('c')).
This is very unattractive because of at least two reasons: 1. It is not possible to change the format e.g. to see milliseconds for performance profiling in the log 2. It is not possible to have a log with UTC timestamps even if the web application has other locale settings.
My recommendation is to give the possibility to assign a Zend_Date object to a Zend_Log object (or even better to a Zend_Date_Formatter object) which defines format and timezone for the log.