there is a data frame ，x
            weekly.returns
 2010-1-4        -0.015933327
 2010-1-11        -0.015042868
 2010-1-18        0.005350297
 2010-1-25        -0.049324703
 2010-2-1        -0.052674121
 when i input 
 colnames(data)[1] <- 'date'
 it becomes
                      date
 2010-1-4        -0.015933327
 2010-1-11        -0.015042868
 2010-1-18        0.005350297
 2010-1-25        -0.049324703
 2010-2-1        -0.052674121
 how can i change ti into:
   date        weekly.returns
 1  2010-1-4        -0.015933327
 2  2010-1-11        -0.015042868
 3  2010-1-18        0.005350297
 4  2010-1-25        -0.049324703
 5  2010-2-1        -0.052674121
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