How can i substract 30 minutes to my timestamp R

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65838480/how-can-i-substract-30-minutes-to-my-timestamp-r

Answer 1

What is the class of your data? If your data is called df check class(df$column_name). If it is of class POSIXct you can do :

df$new_column <- df$column_name - 30*60

Or with lubridate :

df$new_column <- df$column_name - lubridate::minutes(30)

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If the class is something different than POSIXct (eg - character) you need to first change it to POSIXct class before using the answer above. That can be done with

df$column_name <- as.POSIXct(df$column_name, tz = 'UTC')