Hi Amy, you probaly already have visited: http://www.codeproject.com/KB/cs/JalaliCalendar.aspx where the Iranian guy Homam Hosseini provides a discussion of the conversion, and some C code to do it.
I am a C ignorant, but surely someone in the R-community would be able to take this code (and in collaboration with Homam) provide a function that converts Iranian / Jalali dataes to and from the Gregorian Date class?? Best regards Bendix > -----Original Message----- > From: r-sig-epi-boun...@stat.math.ethz.ch > [mailto:r-sig-epi-boun...@stat.math.ethz.ch] On Behalf Of Amy Mikhail > Sent: 7. januar 2009 12:40 > To: r-sig-epi@stat.math.ethz.ch > Subject: [R-sig-Epi] Converting dates from the Persian > calendar to Gregorian > > Dear Epi list, > > This is not a strictly epidemiological question, but an issue > that anyone might face if presented with a dataset containing > dates in a non-gregorian format. > > I am currently developing a database (in MS Access) for a > public health study, the results of which I intend to analyse > in R. I have a small problem, in that the date each patient > visits the clinic will be entered into the database in the > Persian / Jalali calendar format - e.g. today's > date in the Persian calendar is 18.10.1387. For the > analysis however I > need these dates to be converted to Gregorian, so that I can > have months on the x axis of plots, etc. > > Does anyone know of a function / some code already written > that could do this conversion in R? It is much too complex > for me to figure out (since the Persian new year starts on > 21st March, and although there are also 12 months they have > different lengths to gregorian months). I'm guessing it > would require loops and such but this is beyond my current > level of R knowledge. > > I have found some online tools that do the conversion of > individual dates, but there seems to be nothing out there > that would convert a whole dataset's worth of dates. > > Any suggestions much appreciated, > With best wishes, > Amy > > > -- > Amy Mikhail > Program Manager, ACTc Afghanistan Malaria Project London > School of Hygiene & Tropical Medicine HPRO, Charahi-e-Shahid, > Shar-e-Naw, Kabul, Afghanistan > > Email (Afg): amy.mikh...@googlemail.com > Email (UK): amy.mikh...@lshtm.ac.uk > Tel (Afg): +93 (0)706 126627 > Tel (UK): +44 (0)781 4176107 > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-Epi@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-sig-epi > _______________________________________________ R-sig-Epi@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-sig-epi
