[R] How to manipulate the time data without the date?

[tedzzx]

The problem is that: There is some rounding problems, for example
Library(chron)
any(times("4:00:01")==times("4:00:00")+times("00:00:01")))
False

But,it should be true

ggrothendieck-2 wrote:
> 
> On Thu, Nov 6, 2008 at 12:10 PM, tedzzx <zengzhenxing at gmail.com> wrote:
>>
>> Hi,all
>>
>> I only got the time data such as:
>> tms<-c("19:30:23","18:39:10".....)
>>
>> I want to manipulate this time series data. For example, plus one
>> second(or
>> minute) or minus one second
>>
>> This data only has the time(h:m:s), without the date. I know that there
>> are
>> chron package, ISOPix class and the timeDate class, but all these class
>> need
>> the input of date.
> 
> The chron package's times class does not have that restriction:
> 
>> library(chron)
>> times("10:34:21")
> [1] 10:34:21
> 
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