lubridate error message 'incompatible method's when trying date arithmetic
- by Sharon
I'm trying to learn lubridate. The lubridate documentation shows:
date <- ceiling_date(date, "month") - days(1)
[1] "2010-05-31 UTC
for date arithmetic. But if I try
mytoday <- now()
first_of_month <- floor_date(mytoday, "month")
first_of_month_last_year <- first_of_month - years(1)
to use date arithmetic to get the first of the month a year earlier I get an error message
Warning message:
Incompatible methods ("-.POSIXt", "Ops.ordered") for "-"
Any ideas what I'm doing wrong? Thanks.
