함수 prev_month()

1 개요

함수 prev_month()

2 JavaScript

JavaScript

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var d = new Date("2019-07");
d.setMonth(d.getMonth() - 1);
console.log( d.toISOString().substr(0,7) );
// 2019-06

JavaScript

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var mon = "2019-07";
var d = new Date();
d.setFullYear(mon.substr(0,4));
d.setMonth(mon.substr(5,2)-2);
console.log( d.toISOString().substr(0,7) );
// 2019-06

3 PHP

PHP prev_month() 문서를 참고하십시오.

PHP

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<?php
$mon = '2019-07';
echo date("Y-m", strtotime("$mon -1 month"));
# 2019-06

4 R

R prev_month() 문서를 참고하십시오.

R

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require(lubridate)
mon <- "2019-07"
t <- as.Date(paste0(mon,'-01'))
month(t) <- month(t) - 1
next_mon <- format(t, "%Y-%m")
next_mon
## [1] "2019-06"

R

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require(lubridate)
prev_mon <- function(mon) {
  t <- as.Date(paste0(mon,'-01'))
  month(t) <- month(t) - 1
  format(t, "%Y-%m")
}
prev_mon("2019-07")
## [1] "2019-06"
prev_mon("2019-01")
## [1] "2018-12"

5 같이 보기

• 함수 next_month()