I have a dataframe giving attendances at sports events

Crowd    matchDate
2345      1993-01-26
4567      1993-08-01
8888      1994-03-02
1298      1994-11-07
9876      1995-09-01 etc

1237      2011-09-09

The matchdate is a POSIXct class

I want to be able to create a season factor based on the date such that each season runs from, say, 1st August to 31 July e.g factor 1992/3 would include dates 1992-08-01 to 1993-07-31

ideally it would be a function that I could apply for several analyses, not necessarily with same start and end dates in the year

r date
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