I'm so confused! Why does is.na() report TRUE for a POSIXlt date
time of 2014-03-09 02:00:00 ?
q
[1] 2014-03-09 02:00:00
is.na(q)
[1] TRUE
as.POSIXct(q)
[1] NA
dput(q)
structure(list(sec = 0, min = 0L, hour = 2, mday = 9L, mon = 2L,
year = 114L, wday = 0L, yday = 67L, isdst = 0L, zone =
On 30/07/2014 1:08 PM, John McKown wrote:
I'm so confused! Why does is.na() report TRUE for a POSIXlt date
time of 2014-03-09 02:00:00 ?
q
[1] 2014-03-09 02:00:00
is.na(q)
[1] TRUE
as.POSIXct(q)
[1] NA
dput(q)
structure(list(sec = 0, min = 0L, hour = 2, mday = 9L, mon = 2L,
year =
On Wed, Jul 30, 2014 at 12:18 PM, Duncan Murdoch
murdoch.dun...@gmail.com wrote:
On 30/07/2014 1:08 PM, John McKown wrote:
I'm so confused! Why does is.na() report TRUE for a POSIXlt date
time of 2014-03-09 02:00:00 ?
q
[1] 2014-03-09 02:00:00
is.na(q)
[1] TRUE
as.POSIXct(q)
[1] NA
I should have mentioned that I tried other time stamps, generated the
same way as q above.
How did you generate q and in what time zone were you? Note that 2am
on 9 March 2014 is when 'daylight savings time' started in the parts
of the US where it is observed. Does 2am exist or do we jump
Isn't that a timestamp that doesn't exist in standard US timezones? Maybe use a
timezone that doesn't consider daylight savings (like Etc/GMT+5)?
---
Jeff NewmillerThe . . Go Live...
On Wed, Jul 30, 2014 at 12:54 PM, William Dunlap wdun...@tibco.com wrote:
I should have mentioned that I tried other time stamps, generated the
same way as q above.
How did you generate q and in what time zone were you?
I got it from an MS-SQL data base which is maintained by some
OK, daylight saving time, may be be cursed, is definitely my problem.
Strangely, the DB has data for time , 0100, 0200, 0400, 0500, ...
2300. It is closed source, so I have _no_ idea how this happened. And
I cannot report bugs because it is no longer supported. The encoding
is a 4 character
I meant what R commands did you use to change the database's version
of the time/date object to the R version?
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Wed, Jul 30, 2014 at 11:07 AM, John McKown
john.archie.mck...@gmail.com wrote:
On Wed, Jul 30, 2014 at 12:54 PM, William Dunlap
Probably not the best, but here:
con - odbcConnect(BMC);
timezone - Sys.timezone();
#
query=paste0(select CONVERT(smalldatetime,Int_Start_Date,11) as
Int_Start_Date,,
CONVERT(smalldatetime,CASE WHEN Int_Start_Time is NULL
then '00:00' ,
else
Not able to reproduce the problem.
str(q)
# POSIXlt[1:1], format: 2014-03-09 02:00:00
is.na(q)
#[1] FALSE
sessionInfo()
R version 3.1.0 (2014-04-10)
Platform: x86_64-unknown-linux-gnu (64-bit)
A.K.
On Wednesday, July 30, 2014 1:10 PM, John McKown john.archie.mck...@gmail.com
wrote:
I'm so
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