[R] time extraction and normalization

[Simon Knapp]

toDaySecond <- function(date.string, format.string='%d%b%Y:%T', tz='') {
    d <- as.POSIXct(d, format=format.string, tz=tz)
    sum(mapply(function(f, l) as.numeric(format(d, format=f)) * l,
c('%H', '%M', '%S'), c(3600, 60, 1)))
}

toDaySecond('04MAY2011:08:19:00')

Will calculate the second of the day. divide by 3600 to convert to hours.


On Tue, Oct 16, 2012 at 4:21 PM, Jeff Newmiller
<jdnewmil at dcn.davis.ca.us> wrote:
> There are multiple ways. For lack of your example, I would suggest multiplying by 24.
>
> Please post the previous context of the thread if you must post from Nabble.
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>
> york8866 <yu_york at hotmail.com> wrote:
>
>>Thanks,
>>
>>The code gives the numbers in "days", how can I adjust the code to
>>directly
>>get the numbers in "hours"?
>>
>>I tried units but it did not work.
>>
>>Thanks1
>>
>>
>>
>>--
>>View this message in context:
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>>
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