[R] Mystified - comparing chron times

mebstyne mebstyne at me.com
Fri Sep 16 13:36:08 CEST 2011

I have two local variables: startTime and expectedStartTime.  Both are chron
related objects.
When I look at the class for the objects I can see they are of class
When I print them to the console, they both read: "09:30:00"
When I print them as.numeric(), they both read: 0.3958333
When I try and compare them: (as.numeric(startTime) ==
as.numeric(expectedStartTime)) it returns FALSE.

I'm mystified.  I would expect them to be true.
Perhaps a key to the riddle is how the two objects were created.

"startTime" was created by reading a text field from a socket, converting it
into a chron object using chron(x, "%m/$d/%Y %H:%M:%S"), then finally I
created a time out of the chron by doing a quick butchering of the "integer"
portion of the numeric: (times(as.numeric(x) - as.integer(x))

"expectedStartTime" was created by the command times('09:30:00')

Any suggestions?  Tips?  Alternative approaches?  I've pulled too many hairs
triaging this.
All hands welcomed on this little challenge.

Big picture goal of what I'm doing: I have a list of chron objects with both
dates and times portion filled out and I'm trying to determine if the time
is a specific time (specific to the minute).



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