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Determine certain dates in a sequence
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| library(lubridate) | |
| x <- seq(from = mdy("January 23, 1845"), to = today(), by = "1 day") | |
| x[year(x) %% 4 == 0 & month(x) == 11 & day(x) <= 7 & wday(x) == 2] + 1 |
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