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Editorial Team
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Asked: 2026-05-28T21:32:24+00:00

> time1 = strptime(2010-03-01 00:15:00, format = %Y-%m-%d %H:%M:%S) > time2a = strptime(2010-03-01, format

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> time1 = strptime("2010-03-01 00:15:00", format = "%Y-%m-%d %H:%M:%S")
> time2a = strptime("2010-03-01", format = "%Y-%m-%d")
> time2b = as.Date(time2a)
> difftime(time1, time2a)
Time difference of 15 mins
> difftime(time1, time2b)
Time difference of 5.25 hours

From the help page of difftime, date object (time2b) is accepted. Why is the result wrong (5.25 hours)?

Thank you.

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1 Answer

  1. Editorial Team

    The first thing difftime does is check for the tz argument. If missing it uses:

    if(missing(tx)) {
    as.POSIXct(time1)
    as.POSIXct(time2)
}

    testing that:

    > as.POSIXct(time2b)
[1] "2010-02-28 16:00:00 PST"
> as.POSIXct(time2a)
[1] "2010-03-01 PST"

    So it applies my timezone offset to the date object.

    > difftime(time1,time2a)
Time difference of 15 mins
> difftime(time1,time2b,tz='GMT')
Time difference of 15 mins
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