如何计算 R 中日期之间的年数？

在本文中，我们将讨论如何在 R 编程语言中计算两个日期之间的年数或年差。

例子：

Input: 

Date_1 = 2020/02/21

Date_2 = 2023/03/21

Output:

3

Explanation: 

In Date_1 and Date_2 have three years difference in year.

这里我们将使用 seq()函数来获取结果。此函数用于在 Vector 中创建元素序列。

句法：

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

示例 1：

R

# 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：

3

示例 2：

电阻

# 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

输出：

80