For and if confusion

I have two date objects

X <- c("01-03-1993", "01-05-1997") #Mar 1993 and May 1997

Y <- c("01-02-1995", "01-08-1999") #Feb 1995 and Aug 1999

and a time series object

A <- ts(rnorm(120), freq=12, start=c(1992,8)) #Aug 1992 to Aug 2002

I want to create a binary (0-1) vector B that is of length 1:(A). 

B should have value 1 for the time periods *across* my character vectors,
i.e. between Mar 93 ad Feb 95, and also between May-97 and Aug-99, but zero
otherwise.

Would anyone have any ideas on how to do this? I would paste the code I am
trying, but it would confuse rather than clarify (R newbie!). Am getting
really lost in 'for' and 'if' loops, so would really appreciate any help!

Thanks!

Shruthi

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