[R] x axis dates

[pip]

The following data spans out to 2012 and when graphing out the data - R
defaults dates on x axis only shows the years eg 2005    2007    2009  

My question is how can I get the graph to show more dates on the axis - eg
every qtr or 6 months or every month etc

PRODUCT,DATE,AMOUNT_1,AMOUNT_2
A,3/1/2005,126647400,121942966.2
A,4/1/2005,121942966.2,122244045
A,5/1/2005,122244045,117227480.04
A,6/1/2005,117227480.04,117913720.32
A,7/1/2005,117913720.32,116767296.

Regards
Phil

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