On Apr 21, 2012, at 1:17 PM, Veerappa Chetty wrote:
HI,
I have to work with data objects. I have trouble. I would like to
convert
date to a integer of Julian dates omitting hours, minutes etc. I
tried as.
Date and also as.POSIXlt, ct etc.
Please help me to compute the following difference. I get an "NA" for
output.
1/14/2006 0:00:00 AM -1/9/2006 0:00:00 AM
I didn't realize this until I started experimenting with your example,
but there is no 0 hour that is recognized by strptime when using the
am/pm time format:
> strptime("1/14/2006 0:01:01 AM", format ="%m/%d/%Y %I:%M:%S %p")
[1] NA
> strptime("1/14/2006 12:01:01 AM", format ="%m/%d/%Y %I:%M:%S %p")
[1] "2006-01-14 00:01:01"
If you want to offer a reproducible example of your data (not just
console output we can do more with it.) I suggest you take you vector
and offer the output of dput() on it.
--
David.
Thanks.
Chetty
--
Professor of Family Medicine
Boston University
Tel: 617-414-6221, Fax:617-414-3345
emails: chett...@gmail.com,vche...@bu.edu
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