bib.text <- "@Manual{mclean2014,
  author = {Mathew William McLean},
  title = {Straightforward Bibliography Management in R Using the RefManager Package},
  note = {arXiv: 1403.2036 [cs.DL]},
  year = {2014},
  url = {https://arxiv.org/abs/1403.2036},
}"
tfile <- tempfile(fileext = ".bib")
writeLines(bib.text, tfile)
bib <- ReadBib(tfile)
bib[1] <- list(c(date = "2014-03", key = "mwm2014"))
bib
unlink(tfile)
if (FALSE) {
    file.name <- system.file("Bib", "RJC.bib", package="RefManageR")
    bib <- ReadBib(file.name)
    print(bib[seq_len(3L)], .opts = list(sorting = "none", bib.style = "alphabetic"))
    ## add month to Serban et al., add URL and urldate to Jennings et al., and
    ##   add DOI and correct journal to Garcia et al.
    bib[seq_len(3L)] <- list(c(date="2013-12"),
                            c(url="https://bsb.eurasipjournals.com/content/2013/1/13",
                              urldate = "2014-02-02"),
                            c(doi="10.1093/bioinformatics/btt608",
                              journal = "Bioinformatics"))
    print(bib[seq_len(3L)], .opts = list(sorting = "none", bib.style = "alphabetic"))
    bib2 <- bib[seq_len(3L)]
    bib2[2:3] <- bib[5:6]
    bib2
    bib2[3] <- c(journal='', eprinttype = "arxiv", eprint = "1308.5427",
      eprintclass = "math.ST", pubstate = "submitted", bibtype = "misc")
    bib2
}
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