seq(as.Date("2001/1/1"),as.Date("2010/1/1"),"years")
seq(as.Date("2001/1/1"),as.Date("2010/1/1"),"weeks")
seq(as.Date("2001/1/1"),as.Date("2010/1/1"),"days")

why there is no 
seq(as.Date("2001/1/1"),as.Date("2010/1/1"),"quarters")  ?
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