How to Extract Year from Date in R
Last Updated :
22 Feb, 2022
In this article, we are going to see how to extract the year from the date in R Programming Language.
Method 1: Extract Year from a Vector
In this method, the as.POSIXct is a Date-time Conversion Functions that is used to manipulate objects of classes. To extract the year from vector we need to create a vector with some dates and then arrange the date with as.POSIXct() and get year with format() methods.
R
Date <- c ( "01/12/2011 12:40:00" , "11/12/2015 11:40:00" ,
"01/02/2012 05:40:00" , "01/04/2021 09:44:00" ,
"01/02/2020 01:43:00" , "01/12/2014 04:41:00" )
print ( "Vector Date:" )
print (Date)
print ( "Extract Year:" )
Date <- as.POSIXct (Date, format = "%m/%d/%Y %H:%M:%S" )
format (Date, format= "%Y" )
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Output:
[1] "Vector Date:"
[1] "01/12/2011 12:40:00" "11/12/2015 11:40:00" "01/02/2012 05:40:00"
[4] "01/04/2021 09:44:00" "01/02/2020 01:43:00" "01/12/2014 04:41:00"
[1] "Extract Year:"
'2011' '2015' '2012' '2021' '2020' '2014'
Method 2: Extract Year from a Column in a Dataframe
To extract the year from the column, we will create a dataframe with date columns and then separate the year from DateTime using format() methods and extract the year and convert to a numeric format.
R
data_frame = data.frame (Rank = c (5:8) ,
Time = c ( "2021-05-05 01:04:34" ,
"2021-03-06 03:14:44" ,
"2021-03-11 07:22:48" ,
"2021-02-02 11:54:56" ))
print ( "Original dataframe" )
data_frame
data_frame$Time <- as.Date (data_frame$Time)
print ( "Extract year" )
data_frame$year <- as.numeric ( format (data_frame$Time, "%Y" ))
data_frame
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Output:
[1] "Original dataframe"
Rank Time
5 2021-05-05 01:04:34
6 2021-03-06 03:14:44
7 2021-03-11 07:22:48
8 2021-02-02 11:54:56
Extract year
Rank Time year
5 2021-05-05 2021
6 2021-03-06 2021
7 2021-03-11 2021
8 2021-02-02 2021
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