Convert string into date format in R

r date

The as.Date() function will convert a string into date format, and the format of the output will always be in yyyy-mm-dd format in R (ISO 8601). The format argument in the as.Date() function is to specify the date format of the string input. I remember I initially thought it was specifying the output format, but it's the input format (you can change the output format with a subsequent format() function, however this will convert it back to a string).

Your string looks to be in ddmmyyyy (%d%m%Y) format, this should be what you specify as the format argument in as.Date(). Your format does not include hyphens, so the format argument should also not include hyphens. Note that ddmmyyyy, dd-mm-yyyy, dd/mm/yyyy, dd.mm.yyyy are all different date formats, even though the day, month and year are in the same order, they would be converted to date with formats %d%m%Y, %d-%m-%Y, %d/%m/%Y, and %d.%m.%Y, respectively.

Further advice on working with dates and times is available in the relevant chapters of R for Data Science by Wickham & Grolemund and The R Cookbook by Teetor & Long.

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