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Editorial Team
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Asked: 2026-06-12T21:12:30+00:00

This would seem to be a simple task but I’m having difficulty executing it

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This would seem to be a simple task but I’m having difficulty executing it as well as finding examples of how it is done in R.

I have a data frame with about 75K records. One field has dates and it goes back about 11 years. I’ve used the following code to strip off the hours minutes seconds so I just have year-month-day

 dat$date=round.POSIXt(dat$date,units="day")

I am now trying to create a new field “FiscalYear” based on dates such that if the date is between 2008-07-01 and 2009-06-30 it gets assigned FY09…then between 2009-07-01 and 2010-06-30 it gets assigned to FY10, etc…

The method I’ve been trying is with ifelse using >= && <= to set the date ranges but this isn’t working. Any thoughts?

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  1. Editorial Team

    Basically, what Ben said. Here’s an example of what that’d look like in practice. (I’ve used a Date class object, since it sounds like you don’t need the hour/minute/second info.)

    date <- seq(from = as.Date("2010/5/30"), by="week", length=10) ## Example data

cuts <- seq(from = as.Date("2000/7/1"), by="year", length=13) 
labs <- paste0("FY", 1:12)

cut(date, breaks = cuts, labels = labs)
#  [1] FY10 FY10 FY10 FY10 FY10 FY11 FY11 FY11 FY11 FY11
# Levels: FY1 FY2 FY3 FY4 FY5 FY6 FY7 FY8 FY9 FY10 FY11 FY12
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