Parsing complex input

In the previous recipe, we were writing a simple parser for date. Imagine that some time has passed and the task has changed. Now, we need to write a date-time parser that supports multiple input formats and zone offsets. Our parser must understand the following inputs:

2012-10-20T10:00:00Z      // date time with zero zone offset 
2012-10-20T10:00:00       // date time without zone offset 
2012-10-20T10:00:00+09:15 // date time with zone offset 
2012-10-20-09:15          // date time with zone offset 
10:00:09+09:15            // time with zone offset 

Getting ready

We'll be using the Boost.Spirit library, which was described in the Parsing simple input recipe. Read it before getting hands on with this...