R-exercises – Parsing Dates and Time

Below are the solutions to these exercises on date and time

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# Exercise 1  #
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library(anytime)

## Warning: package 'anytime' was built under R version 3.4.4

library(lubridate)
mar_22_2018 <- c("mar-22-2018","2018/03/22", "2018-03-22","22 mar 2018")
anytime(mar_22_2018)

## [1] "2018-03-22 PDT" "2018-03-22 PDT" "2018-03-22 PDT" "2018-03-22 PDT"

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# Exercise 2  #
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anytime(mar_22_2018,asUTC = T)

## [1] "2018-03-21 17:00:00 PDT" "2018-03-21 17:00:00 PDT"
## [3] "2018-03-21 17:00:00 PDT" "2018-03-21 17:00:00 PDT"

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# Exercise 3  #
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as.POSIXct("2018-03-22 12:30:00")

## [1] "2018-03-22 12:30:00 PDT"

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# Exercise 4  #
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as.POSIXct("2018-03-22 12:30:00","Europe/London")

## [1] "2018-03-22 12:30:00 GMT"

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# Exercise 5  #
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require(lubridate)
ymd("2018-mar-22")

## [1] "2018-03-22"

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# Exercise 6  #
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dmy("22-mar-2018")

## [1] "2018-03-22"

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#             #
# Exercise 7  #
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  mdy("mar-22-2018")

## [1] "2018-03-22"

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#             #
# Exercise 8  #
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dym("22/2018/03")

## [1] "2018-03-22"

ymd("2018-03-22")

## [1] "2018-03-22"

Wan 1 March 2021 at 04:45 on Introduction to Statistical Testing and Sampling: Exercises (Part 1)Hi, thanks for this. I can understand Q1-5 easily, but from 6 onwards I'm not familiar with the syntax so...
Moh 1 March 2021 at 00:08 on Vectors and FunctionsThank you for the exercises I guess there is a mistake in exercise 4, second question: x <- c(152.34, 1940.63,...
anne-bowery 23 February 2021 at 12:49 on Power Analysis TutorialHi, does pwr package take randomness into account? I mean without the package I used to perform eg. 10000 simulations...
Badia 18 February 2021 at 13:16 on Bioinformatics Tutorial with Exercises in R (part 1) – SolutionsFor exercise 10, I got this error Error in .Call2("DNAStringSet_translate", x, skip_code, dna_codes[codon_alphabet], : not a base at pos 8...
Eunseong 2 February 2021 at 05:05 on Higher Order Functions ExercisesThank you so much for making a good exercise. In Exercise 5, you said that the spatstat package has is.prime()...

Parsing Dates and Time – Part 1: Solutions