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...9; (they seem to be identical). For instance, from the documentation, -------------------- mdy.date {survival} R Documentation Convert to Julian Dates Description Given a month, day, and year, returns the number of days since January 1, 1960. Usage mdy.date(month, day, year, nineteen = TRUE, fillday = FALSE, fillmonth = FALSE) ---------------------------- but > library(survival) > mdy.date(12, 1, 1977) [1] 1Dec77 Similar strange results appear in other date-related functions. I plan to write functions that converts, eg, "1977-01-31" to the real number 1977.084 and b...