一年中增加几个月和几天
[英]Add months and days to year
问题描述
I have a data frame in which a variable contains dates with different formats: 
我有一个数据框，其中变量包含具有不同格式的日期：
1970-01-09
1974
1970
1987-05-28
1970-06-01
1980
I would like to add "01-01" to all the dates where I only have the year available in order to have the same format for every date. 我想在只有可用年份的所有日期上添加“ 01-01”，以便每个日期都具有相同的格式。
Any suggestion is welcome. 任何建议都欢迎。
1 个解决方案
解决方案1
3 已采纳 2018-10-31 10:35:24
Using anytime package: 使用随时打包：
library(anytime)
x <- c("1970-01-09","1974","1970","1987-05-28","1970-06-01","1980")
anydate(x)
# [1] "1970-01-09" "1974-01-01" "1970-01-01" "1987-05-28" "1970-06-01" "1980-01-01"
Or use paste : 或使用粘贴 ：
ifelse(nchar(x) == 4, paste(x, "01-01", sep = "-"), x)
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