R dates origin must be supplied

Question

My code  axis Date 1 sites date  origin  quot 1970-01-01 quot    Error  Error in as Date numeric x     origin  must be supplied  Why is it asking me for the origin when I supplied it in the above code

User · Answer

If you have both date and time information in the numeric value, then use as.POSIXct. Data.table package IDateTime format is such a case. If you use fwrite to save a file, the package automatically converts date-times to idatetime format which is unix time. To convert back to normal format following can be done.

Example: Let's say you have a unix time stamp with date and time info: 1442866615

> as.POSIXct(1442866615,origin="1970-01-01")
[1] "2015-09-21 16:16:54 EDT"

User · Answer

So generally this has been solved  but you might get this error message because the date you use is not in the correct format  I know this is an old post  but whenever I run this I get NA all the way down my date column  My dates are in this format 20150521     NealC Jun 5  15 at 16 06 If you have dates of this format just check the format of your dates with  str sides date   If the format is not a character  then convert it  as character sides date   For as Date  you won t need an origin any longer  because this is supplied for numeric values only  Thus you can use  assuming you have the format of NealC   as Date as character sides date  format  quot  Y m d quot    I hope this might help some of you

User · Answer

by the way  the zoo package  if it is loaded  overrides the base as Date   with its own which  by default  provides origin  1970-01-01     i mention this in case you find that sometimes you need to add the origin  and sometimes you don t

User · Answer

Another option is the lubridate package   library lubridate   x  lt - 15103 as date x  origin   lubridate  origin   2011-05-09   y  lt - 1442866615 as datetime y  origin   lubridate  origin   2015-09-21 20 16 55 UTC    From the docs      Origin is the date-time for 1970-01-01 UTC in POSIXct format  This date-time is the origin for the numbering system used by POSIXct  POSIXlt  chron  and Date classes

User · Answer

I suspect you meant  axis Date 1  as Date sites date  origin    quot 1970-01-01 quot     as the  x  argument to as Date   has to be of type Date  As an aside  this would have appropriate as a follow-up or edit of your previous question

User · Answer

My R use 1970-01-01    gt as Date 15103  origin  1970-01-01    1   2011-05-09    and this matches the calculation from    gt as numeric as Date 15103  origin  1970-01-01

[r] R dates "origin" must be supplied

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