[R] Date conversion

[Pele]

Hi R users,

I have a factor variable called date as shown below:  Can anyone share the
best / most efficient way to extract year and week (e.g.  year = 2006, week
= 52 for first record, etc..)?  My data set has 1 million records.

DATE        
11DEC2006 
11SEP2006
01APR2007
02DEC2007


Thanks in advance for any help!
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