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## (the origin used by SAS)
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## (the origin used by SAS)
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z <- 1472562988
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z <- 1472562988
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# ways to convert this
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# ways to convert this
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as.POSIXct(z, origin = "1960-01-01")                # local
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as.POSIXct(z, origin = "1960-01-01")                # local
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as.POSIXct(z, origin = "1960-01-01", tz = "GMT")    # in UTC
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as.POSIXct(z, origin = "1960-01-01", tz = "GMT")    # in UTC
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as.POSIXct(z, origin = ISOdatetime(1960,1,1,0,0,0)) # local
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ISOdatetime(1960,1,1,0,0,0) + z                   # local
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## SPSS dates (R-help 2006-02-16)
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## SPSS dates (R-help 2006-02-16)
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z <- c(10485849600, 10477641600, 10561104000, 10562745600)
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z <- c(10485849600, 10477641600, 10561104000, 10562745600)
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as.Date(as.POSIXct(z, origin = "1582-10-14", tz = "GMT"))
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as.Date(as.POSIXct(z, origin = "1582-10-14", tz = "GMT"))
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