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Fast Date Part Extracting

Source: R/date-part.R, R/extendr-wrappers.R
date_part.Rd

These date helper functions provide the similar functionalities like in data.table or lubridate package. They are implemented by the Rust Lang's standard library and very fast.

Usage

year(ref_date)

month(ref_date)

quarter(ref_date)

isoweek(ref_date)

isowday(ref_date)

wday(ref_date)

mday(ref_date)

yday(ref_date)

Arguments

ref_date,

a Date vector. It will try to convert the input to date via ymd(), if the input is not a Date.

Value

an integer vector

Details

  • year, month, quarter: get the year, month, quarter part

  • yday: the day of year

  • mday: the day of month

  • wday: the day of the week (Sunday is 1)

  • isoweek: ISO 8601 week

  • isowday: the day of week (ISO 8601 weekday number, Monday is 1)

References

ISO week day, https://en.wikipedia.org/wiki/ISO_week_date ISO 8601, https://en.wikipedia.org/wiki/ISO_8601

Examples

year(210205)
#> [1] 2021
month(210205)
#> [1] 2
quarter(210205)
#> [1] 1
yday(210205)
#> [1] 36
mday(210205)
#> [1] 5
wday(210117)
#> [1] 1
isowday(210117)
#> [1] 7
isoweek(210101)
#> [1] 53