R语言如何计算日期之间的年数

在这篇文章中，我们将讨论如何用R编程语言计算两个日期之间的年数或年差。

例子。

输入。

Date_1 = 2020/02/21

日期_2 = 2023/03/21

输出。

解释。

在Date_1和Date_2中，年份相差3年。

这里我们将使用seq()函数来得到结果。这个函数是用来创建一个向量中的元素序列的。

语法。

length(seq(from=date_1, to=date_2, by=’year’))-1

例1 :

# creating date_1 variable and
# storing date in it.
date_1<-as.Date("2020-08-10")
  
# creating date_2 variable and
 #storing date in it.
date_2<-as.Date("2023-10-10")
  
# Here first date will start from
# 2020-08-10 and end by 2023-10-10.
# Here increment is done by year.
# This three dates will be generated
# as we used eq and this dates will
# be stored in a.
a = seq(from = date_1, to = date_2, by = 'year')
  
# Here we are finding length of a and
# we are subtracting 1 because we dont
# need to include current year.
length(a)-1

输出。

例2 :

# creating date_1 variable and
# storing date in it.
date_1<-as.Date("2020-08-10")
 
# creating date_2 variable and
# storing date in it.
date_2<-as.Date("2100-08-10")
 
# Here first date will start from
# 2020-08-10 and end by 2100-08-10.
# Here increment is done by year.
# This three dates will be generated
# as we used seq and this dates will
# be stored in a.
a = seq(from = date_1, to = date_2, by = 'year')
 
# Here we are finding length of a and
# we are subtracting 1 because we dont
# need to include current year.
length(a)-1