How to sort a data frame by date

Question

I need to sort a data frame by date in R   The dates are all in the form of   dd mm yyyy   The dates are in the 3rd column   The column header is V3   I have seen how to sort a data frame by column and I have seen how to convert the string into a date value   I can t combine the two in order to sort the data frame by date

User · Answer

The only way I found to work with hours  through an US format in source  mm-dd-yyyy HH-MM-SS PM AM      df dataSet time  lt - as POSIXct  df dataSet time   format     m  d  Y  I  M  S  p    tz    GMT   class df dataSet time  df dataSet  lt - df dataSet do call order  df dataSet

User · Answer

If you just want to rearrange dates from oldest to newest in r etc  you can always do   dataframe  lt - dataframe nrow dataframe  1     It s saved me exporting in and out from excel just for sort on Yahoo Finance data

User · Answer

Nowadays  it is the most efficient and comfortable to use lubridate and dplyr libraries   lubridate contains a number of functions that make parsing dates into POSIXct or Date objects easy  Here we use dmy which automatically parses dates in Day  Month  Year formats  Once your data is in a date format  you can sort it with dplyr  arrange  or any other ordering function  as desired    d V3  lt - lubridate  dmy d V3  dplyr  arrange d  V3

User · Answer

You can use order   to sort date data     Sort date ascending order d order as Date d V3  format     d  m  Y         Sort date descending order d rev order as Date d V3  format     d  m  y         Hope this helps   Link to my quora answer https   qr ae TWngCe  Thanks

User · Answer

If you have a dataset named daily data   daily data lt -daily data order as Date daily data date  format   d  m  Y

User · Answer

Assuming your data frame is named d   d order as Date d V3  format   d  m  Y        Read my blog post  Sorting a data frame by the contents of a column  if that doesn t make sense

User · Answer

In case you want to sort dates with descending order the minus sign doesn t work with Dates   out  lt - DF rev order as Date DF end        However you can have the same effect with a general purpose function  rev    Therefore  you mix rev and order like    init data DF  lt - data frame ID c  ID3    ID2   ID1    end c  4 1 09 12 00    6 1 10 14 20    1 1 11 11 10    change order out  lt - DF rev order as Date DF end        Hope it helped

[r] How to sort a data frame by date

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