[R] Problem with Julian function

From: Devred, Emmanuel <DevredE_at_mar.dfo-mpo.gc.ca>
Date: Thu 15 Jun 2006 - 21:50:44 EST

Dear all,

I have a problem with the function Julian, may be a bug in the function ? Here is a vector of character, which represents dates (May 18 to May 20 2000):

 > amj <- c("2000-05-18","2000-05-18","2000-05-18","2000-05-19","2000-05-19"  > ,"2000-05-19", "2000-05-19", "2000-05-20", "2000-05-20", "2000-05-20")

I load the date and chron libraries, I define the vector of character as a date variable using the dates function:

> ymd <- dates(amj,format=c(dates="y-m-d"),origin=c(month=1,

Then when I apply the Julian function:

> julian(months(ymd),days(ymd),years(ymd),origin=c(month = 1, day = 1, year
= as.numeric(years(ymd[1]))))

I get the following result:

[1] 137 137 137 138 138 138 138 139 139 139

However, when I check on the calendar, the dates I have correspond to the 139th, 140th and 141st days of the year (there is a two days shift because it is a leap year, for other years I have a one day shift). I tried the default origin when I use the dates function but I get the same results.

Did anyone have this problem before ? I would appreciate some help,

  Thank you very much,


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