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Date formats (2)

Not only can you convert characters to dates, but you can convert objects that are already dates to differently formatted dates using format():

# The best point move in stock market history. A +936 point change in the Dow!
best_date
[1] "2008-10-13"

format(best_date, format = "%Y/%m/%d")
[1] "2008/10/13"

format(best_date, format = "%B %d, %Y")
[1] "October 13, 2008"

As a reminder, here are the formats:

  • %Y: 4-digit year (1982)
  • %y: 2-digit year (82)
  • %m: 2-digit month (01)
  • %d: 2-digit day of the month (13)
  • %A: weekday (Wednesday)
  • %a: abbreviated weekday (Wed)
  • %B: month (January)
  • %b: abbreviated month (Jan)

Cet exercice fait partie du cours

Intermediate R for Finance

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Instructions

  • Create the vector dates from char_date, specifying the format so R reads them correctly.
  • Modify dates using format() so that each date looks like "Jan 04, 17".
  • Modify dates using format() so that each date looks like "01,04,2017".

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

char_dates <- c("1jan17", "2jan17", "3jan17", "4jan17", "5jan17")

# Create dates using as.Date() and the correct format 
dates <- ___

# Use format() to go from "2017-01-04" -> "Jan 04, 17"
___

# Use format() to go from "2017-01-04" -> "01,04,2017"
___
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