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Edit lesson fix issue due to locale-specific translation of character strings with strptime #45

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Edit lesson fix issue due to locale-specific translation of character strings with strptime #45

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10 changes: 6 additions & 4 deletions R_Programming/Dates_and_Times/lesson.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
Type: Coursera
Organization: JHU Biostat
Version: 2.2.11
Parse: -_-

- Class: text
Output: R has a special way of representing dates and times, which can be helpful if you're working with data that show how something changes over time (i.e. time-series data) or if your data contain some other temporal information, like dates of birth.
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Output: strptime() converts character vectors to POSIXlt. In that sense, it is similar to as.POSIXlt(), except that the input doesn't have to be in a particular format (YYYY-MM-DD).

- Class: cmd_question
Output: 'To see how it works, store the following character string in a variable called t3: "October 17, 1986 08:24" (with the quotes).'
CorrectAnswer: t3 <- "October 17, 1986 08:24"
AnswerTests: omnitest(correctExpr='t3 <- "October 17, 1986 08:24"')
Hint: Store "October 17, 1986 08:24" (including the quotes) in a new variable called t3.
Output: 'To see how it works, store the following character string in a variable called t3: "-_-" (with the quotes).'
CorrectAnswer: t3 <- "-_-"
AnswerTests: omnitest(correctExpr='t3 <- "-_-"')
Hint: Store "-_-" (including the quotes) in a new variable called t3.
Parse: format(x = as.POSIXlt("1986-10-17 08:24"), format = "%B %d, %Y %H:%M")

- Class: cmd_question
Output: 'Now, use strptime(t3, "%B %d, %Y %H:%M") to help R convert our date/time object to a format that it understands. Assign the result to a new variable called t4. (You should pull up the documentation for strptime() if you''d like to know more about how it works.)'
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