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More generally, if you Google for R MATLAB, there are some online references that provide varying levels of function mappings between the two languages that you may find helpful. The last step takes the date and coerces it to a numeric value in the number of days since the origin. The following information is entered or selected during an Origin installation: 1. So your 'b' should be 3, not 2, presuming the first of the month is inferred. To install Origin, log in using an Administrator log in account. Taking your number above of 683429, that would yield: Looking at the help page for ?as.Date, there is information pertaining to MATLAB's date origin of, as compared to R's of. The standard date classes in R require the full date (day, month, year) and the date/time classes require a correct time as well. > It should be a simple operation but I cannot seem to figure it out. > tried the ISOdatetime function but that returned NA for all entries. > In R, I have tried the as.POSIXct function but did not succeed. > In MATLAB this can easily be done using the syntax > Meanwhile, when I check the class type of columns a and b, they are > 1871 and month 2, stored in different vectors, should return 683429. > these two date vectors, into a single serial date number. I need to convert these year-month combinations, stored in > like 1871, and another column (call this column b) contains months, One column (call this column a) contains years, > On Apr 4, 2017, at 8:51 AM, Tunga Kantarcı wrote: Next message (by thread): Converting date vector into a serial date number.Previous message (by thread): Converting date vector into a serial date number.Converting date vector into a serial date number Marc Schwartz marc_schwartz at me.com Converting date vector into a serial date number