Abstract
Lubridate starts out answering a simple question—is it AM or PM, based on a date and hour? From there, it gets more complex but maintains a consistent approach to working with dates, times, and the combination date-times.
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Notes
- 1.
www.rdocumentation.org/packages/lubridate/versions/1.5.6/topics/int_shift. Accessed on January 22, 2021.
- 2.
Private correspondence with Michael Torbett, retired professor of astronomy at Macon State University. January 30, 2021.
- 3.
“Working with Dates and Time in R Using the Lubridate Package | University of Virginia Library Research Data Services + Sciences,” accessed on January 22, 2021, https://data.library.virginia.edu/working-with-dates-and-time-in-r-using-the-lubridate-package/.
- 4.
https://cran.r-project.org/web/packages/lubridate/lubridate.pdf, 57. Accessed on January 22, 2021.
- 5.
“Interval Function | R Documentation,” accessed on January 22, 2021, www.rdocumentation.org/packages/lubridate/versions/1.7.4/topics/interval.
- 6.
According to Wikipedia.org, “A week is defined as an interval of exactly seven days,[b] so that technically, except at daylight saving time transitions or leap seconds, 1 week = 7 days = 168 hours = 10,080 minutes = 604,800 seconds.” <EmphasisFontCategory=”NonProportional”>https://en.wikipedia.org/wiki/Week</Emphasis>, accessed on January 22, 2021.
- 7.
This reminds me of the Latin term “novus ordo seclorum,” which is printed on the back of a US one dollar bill. It means “a new order of the ages.” Apparently, the R designers considered their new order date as January 1, 1970.
- 8.
“Coordinated Universal Time,” in Wikipedia, January 19, 2021, https://en.wikipedia.org/w/index.php?title=Coordinated_Universal_Time&oldid=1001289270.
- 9.
“Guess_formats + R + Lubridate,” Stack Overflow, accessed on January 22, 2021, https://stackoverflow.com/questions/26064292/guess-formats-r-lubridate.
- 10.
“Ms Function | R Documentation,” accessed on January 23, 2021, www.rdocumentation.org/packages/lubridate/versions/1.7.9.2/topics/ms.
- 11.
https://cran.r-project.org/web/packages/lubridate/lubridate.pdf. Accessed on January 25, 2021.
- 12.
“Php – List of All Locales and Their Short Codes? – Stack Overflow,” accessed on January 24, 2021, https://stackoverflow.com/questions/3191664/list-of-all-locales-and-their-short-codes.
- 13.
https://cran.r-project.org/web/packages/lubridate/lubridate.pdf. Accessed on January 24, 2021.
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Yarberry, W. (2021). Lubridate: Date and Time Processing. In: CRAN Recipes. Apress, Berkeley, CA. https://doi.org/10.1007/978-1-4842-6876-6_3
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