Question

#A dataset call "charDate" , class is "character"
charDate
[1] "2017-01-19" "42431"      "42455"      "42430"  "2017-01-08"  "2017-01-08"

将as.Date应用于origin ="1900-01-01后，其成为NA

as.Date.character(charDate, origin = "1900-01-01")
[1] "2017-01-19" NA           NA           NA           "2017-01-08" "2017-01-08"

如何避免它成为NA？

Answer 1

我们可以分两步完成。首先，在OP的帖子中转换'charDate'，我们得到数字元素的NA。子集来自“charDate”中与“new”（--my_long_calculation = (FLOOR(DATEPART(DAY, DATEADD(MINUTE, [table1].someInt, [table1].someDate)) / 1440.0) % 2) + 1 SELECT [table1].ID FROM [table1] INNER JOIN [table2] ON [table2].someattribute = my_long_calculation INNER JOIN [table3] ON [User].someattribute = my_long_calculation WHERE my_long_calculation = 1）中的NA元素对应的元素，将其转换为is.na类，然后执行numeric

as.Date

数据

new <- as.Date(charDate, origin = "1900-01-01")
new[is.na(new)] <- as.Date(as.numeric(charDate[is.na(new)]), origin = "1900-01-01")
new
#[1] "2017-01-19" "2016-03-04" "2016-03-28" "2016-03-03" "2017-01-08" "2017-01-08"

如何将序列号日期的日期与同一列中的正常日期混合

1 个答案:

数据