XTS Subsetting question (noob)

Hi,
How can an xts object be subset using a date in a variable? 
E.g. in below, what is the right syntax for Q to get the same value as P?
Obviously the syntax shown below doesnt work...
V is an xts object.

d = "2007-01-01"
P <- V['2007-01-01/']
Q <- V['d/']

Thanks,
J



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