Why is this not giving me a whole number of days?
difftime("2015-04-22", "2014-10-30")
Time difference of 173.9583 days
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I appreciate I can round this up, but I'm confused as to the default behaviour. – ChrisP Jun 08 '17 at 16:28
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You can use `?difftime` to see the documentation. `difftime("2015-04-22", "2014-10-30", units="days")` – JasonWang Jun 08 '17 at 16:29
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@JasonWang it gives the same result – ChrisP Jun 08 '17 at 16:30
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Does it work on yours - if so, guess it's something to do with my computer then? – ChrisP Jun 08 '17 at 16:31
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What's your R version? – JasonWang Jun 08 '17 at 16:32
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R version 3.4.0 (2017-04-21) – ChrisP Jun 08 '17 at 16:32
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1.9583 * 24 = 23. Could it be Summer time? Wella wella wella – ekstroem Jun 08 '17 at 16:32
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Ahh - clock changes maybe... – ChrisP Jun 08 '17 at 16:33
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On R 3.2.2, even the code in the question yields 174. – Benjamin Jun 08 '17 at 16:34
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I assumed since there wasn't a time component the same would be applied to both dates, but that wouldn't matter if clock changes are applied automatically - how do I stop that? – ChrisP Jun 08 '17 at 16:34
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2Does this work? `difftime(as.Date("2015-04-22"), as.Date("2014-10-30"))` – JasonWang Jun 08 '17 at 16:34
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@JasonWang - tried 3.3.2 and get the same problem. It's definitely(?) a clock change thing – ChrisP Jun 08 '17 at 16:37
1 Answers
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Use the Date class to avoid the extra complexity of timestamps, daylight savings time, etc.
> as.Date("2015-04-22") - as.Date("2014-10-30")
Time difference of 174 days
Gregor Thomas
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