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  3. Working with Dates and Times in R

Exercise

Arithmetic and logical operators

Since Date objects are internally represented as the number of days since 1970-01-01 you can do basic math and comparisons with dates. You can compare dates with the usual logical operators (<, ==, > etc.), find extremes with min() and max(), and even subtract two dates to find out the time between them.

In this exercise you'll see how these operations work by exploring the last R release. You'll see Sys.date() in the code, it simply returns today's date.

Instructions

100 XP
  • Find the date of the most recent release by calling max() on the date column in releases.
  • Find the rows in releases that have the most recent date, by specifying the comparison date == last_release_date in filter()
  • Print last_release to see which release this was.
  • Calculate how long it has been since the most recent release by subtracting last_release_date from Sys.Date().