Handling Date & Time in R
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The document outlines a comprehensive curriculum for learning date and time manipulation using R programming, including practical exercises related to invoicing, date extraction, and time zones. It covers subjects such as leap years, parsing dates, and interval calculations, providing examples and tasks for the reader to complete. Additionally, it emphasizes data sanitization and the use of various R functions to handle date-related operations effectively.
Handling Date & Time in R
- 4. Let’s Begin to Learn Rsquared Academy → → → → → → → → → → →
- 6. Best Way to Learn Rsquared Academy → → → → → → →
- 8. Current Date/Time Rsquared Academy → Sys.Date() / today() → Sys.time() / now() → am() → pm() → leap_year()
- 9. Your Turn... Rsquared Academy → get current date → get current time → check whether the time is in AM or PM? → check whether the following are leap years → 2018 → 2016
- 10. Case Study - Data Rsquared Academy
- 11. Case Study Rsquared Academy → extract date, month and year from Due → compute the number of days to settle invoice → compute days over due → check if due year is a leap year → check when due day in february is 29, whether it is a leap year → how many invoices were settled within due date → how many invoices are due in each quarter → what is the average duration between invoice date and payment date
- 13. Date & Time Classes Rsquared Academy → Date → POSIXct → POSIXlt
- 14. ISO 8601 Standard Rsquared Academy
- 15. POSIXlt Rsquared Academy → sec → min → hour → mon → zone → wday → mday → year → yday → ist → gmtoff
- 16. Your Turn... Rsquared Academy R 1.0.0 was released on 2000-02-09 08:55:23 UTC. Save it as → Date → Date using origin → POSIXct → POSIXlt and extract → month day → day of year → month → zone → ISODate
- 18. Course Duration Rsquared Academy
- 19. Shift Date Rsquared Academy
- 20. Your Turn... Rsquared Academy → compute the length of a vacation which begins on 2020-04-19 and ends on 2020-04-25 → recompute the length of the vacation after shifting the vacation start and end date by 10 days and 2 weeks → compute the days to settle invoice and days overdue from the receivables.csv data set → compute the length of employment (only for those employees who have been terminated) from the hr-data.csv data set (use date of hire and termination)
- 22. Time Zones Rsquared Academy
- 23. Daylight Savings Rsquared Academy
- 24. Your Turn... Rsquared Academy → check the time zone you live in → check if daylight savings is in effect → check the current time in UTC or any other time zone
- 26. Formats Rsquared Academy → December 12, 2019 → 12th Dec, 2019 → Dec 12th, 19 → 12-Dec-19 → 12 December, 2019 → 12.12.19
- 27. Conversion Specifications Rsquared Academy Specification Description Example %d Day of the month (decimal number) 12 %m Month (decimal number) 12 %b Month (abbreviated) Dec %B Month (full name) December %y Year (2 digit) 19 %Y Year (4 digit) 2019 %H Hour 8 %M Minute 5 %S Second 3
- 28. Your Turn... Rsquared Academy Use conversion specifications to specify the below dates using as.Date() → 05.07.19 → 5-July, 2019 → July 5th, 2019 → July 05, 2019 → 2019-July-05 → 05/07/2019 → 07/05/2019 → 7/5/2019 → 07/5/19 → 2019-07-05
- 30. Parse Date & Time Rsquared Academy → Convert string/character to date using → strptime() → parse_date_time() → Convert date to string character using → strftime() → as.character() → format() → Use helper functions to convert string/character to date without using conversion specifications.
- 31. Your Turn... Rsquared Academy Parse the below dates using strptime()/parse_date_time() or appropriate helper functions: → 05.07.19 → 5-July, 2019 → July 5th, 2019 → July 05, 2019 → 2019-July-05 → 05/07/2019 → 07/05/2019 → 7/5/2019 → 07/5/19 → 2019-07-05
- 33. Components Rsquared Academy → year → month → date → week → day → quarter → semester → hour → minute → second → timezone
- 34. Year, Month & Week Rsquared Academy Function Description year() Get year month() Get month (number) month(label = TRUE) Get month (abbreviated name) month(abbr = FALSE) Get month (full name) months() Get month week() Get week
- 35. Day Rsquared Academy Function Description day() Get day mday() Day of the month wday() Day of the week qday() Day of quarter yday() Day of year weekdays() Day of week days_in_month() Days in the month
- 36. HMS Rsquared Academy Function Description hour() Get hour minute() Get minute second() Get second seconds() Number of seconds since 1970-01-01
- 37. Quarter & Semester Rsquared Academy
- 38. Quarter & Semester Rsquared Academy Function Description quarter() Get quarter quarter(with_year = TRUE) Quarter with year quarter(fiscal_start = 4) Fiscal starts in April quarters() Get quarter semester() Get semester
- 39. Case Study - Components Rsquared Academy
- 40. Case Study - Data Sanitization Rsquared Academy Let us do some data sanitization. If the due day happens to be February 29, let us ensure that the due year is a leap year. Below are the steps to check if the due year is a leap year: ➔ we will extract the following from the due date: → day → month → year ➔ we will then create a new column is_leap which will have be set to TRUE if the year is a leap year else it will be set to FALSE ➔ filter all the payments due on 29th Feb ➔ select the following columns: → Due → is_leap
- 41. Your Turn... Rsquared Academy Get the R release dates using r_versions() from the rversions package and tabulate the following → year → month with label → weekday with label → hour → and quarter
- 43. Create, Update & Verify Rsquared Academy → make_date() → make_datetime() → update()
- 44. Date Sequence Rsquared Academy Function Description from Starting date of the sequence by End date of the sequence to Date increment of the sequence length.out Length of the sequence along.with Use length of this value as length of sequence
- 45. Your Turn... Rsquared Academy R 2.0.0 was released on 2004-10-04 14:24:38. Create this date using ➢ make_date() ➢ make_datetime() ➢ and update to 2013-04-03 07:12:36 (R 3.0.0 release date)
- 48. Shift Interval Rsquared Academy
- 49. Interval Overlap Rsquared Academy
- 50. Case Study Rsquared Academy Let us use intervals to count the number of invoices that were settled within the due date. To do this, we will: ➢ create an interval for the invoice and due date ➢ create a new column due_next by incrementing the due date by 1 day ➢ another interval for due_next and the payment date ➢ if the intervals overlap, the payment was made within the due date
- 52. Within Rsquared Academy Let us use %within% to count the number of invoices that were settled within the due date. We will do this by: ➢ creating an interval for the invoice and due date ➢ check if the payment date falls within the above interval
- 55. Time Length Rsquared Academy
- 57. Rounding Dates Rsquared Academy We will explore functions for rounding dates ➢ to the nearest value using round_dates() ➢ down using floor_date() ➢ up using ceiling_date()
- 58. Rounding Dates Rsquared Academy The unit for rounding can be any of the following: ➢ second ➢ minute ➢ hour ➢ day ➢ week ➢ month ➢ bimonth ➢ quarter ➢ season ➢ halfyear ➢ and year
- 59. Your Turn... Rsquared Academy ➢ round up R release dates to hours ➢ round down R release dates to minutes ➢ rollback R release dates to the beginning of the month
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