Format values as date-times

Source: R/format_data.R

Format input date-time values that are character-based and expressed according to the ISO 8601 date-time format (YYYY-MM-DD HH:MM:SS). Once the appropriate data cells are targeted with columns (and, optionally, rows), we can simply apply preset date and time styles to format the date-time values. The following date styles are available for simpler formatting of the date portion (all using the input date of 2000-02-29 in the example output dates):

  1. iso: 2000-02-29

  2. wday_month_day_year: Tuesday, February 29, 2000

  3. wd_m_day_year: Tue, Feb 29, 2000

  4. wday_day_month_year: Tuesday 29 February 2000

  5. month_day_year: February 29, 2000

  6. m_day_year: Feb 29, 2000

  7. day_m_year: 29 Feb 2000

  8. day_month_year: 29 February 2000

  9. day_month: 29 February

  10. year: 2000

  11. month: February

  12. day: 29

  13. year.mn.day: 2000/02/29

  14. y.mn.day: 0/02/29

The following time styles are available for simpler formatting of the time portion (all using the input time of 14:35:00 in the example output times):

  1. hms: 14:35:00

  2. hm: 14:35

  3. hms_p: 2:35:00 PM

  4. hm_p: 2:35 PM

  5. h_p: 2 PM

We can use the info_date_style() and info_time_style() functions as useful references for all of the possible inputs to date_style and time_style.

fmt_datetime(data, columns, rows = NULL, date_style = 2, time_style = 2)

Arguments

data

A table object that is created using the gt() function.
columns

The columns to format. Can either be a series of column names provided in vars(), a vector of column indices, or a helper function focused on selections. The select helper functions are: starts_with(), ends_with(), contains(), matches(), one_of(), and everything().
rows

Optional rows to format. Not providing any value results in all rows in columns being formatted. Can either be a vector of row captions provided c(), a vector of row indices, or a helper function focused on selections. The select helper functions are: starts_with(), ends_with(), contains(), matches(), one_of(), and everything(). We can also use expressions to filter down to the rows we need (e.g., [colname_1] > 100 & [colname_2] < 50).
date_style

The date style to use. Supply a number (from 1 to 14) that corresponds to the preferred date style. Use info_date_style() to see the different numbered and named date presets.
time_style

The time style to use. Supply a number (from 1 to 5) that corresponds to the preferred time style. Use info_time_style() to see the different numbered and named time presets.

Value

An object of class gt_tbl.

Details

Targeting of values is done through columns and additionally by rows (if nothing is provided for rows then entire columns are selected). A number of helper functions exist to make targeting more effective. Conditional formatting is possible by providing a conditional expression to the rows argument. See the Arguments section for more information on this.

Figures

Function ID

3-7

See also

Other Format Data: data_color(), fmt_currency(), fmt_date(), fmt_markdown(), fmt_missing(), fmt_number(), fmt_passthrough(), fmt_percent(), fmt_scientific(), fmt_time(), fmt(), text_transform()

Examples

# Use `exibble` to create a gt table;
# keep only the `datetime` column;
# format the column to have dates
# formatted as `month_day_year` and
# times to be `hms_p`
tab_1 <-
  exibble %>%
  dplyr::select(datetime) %>%
  gt() %>%
  fmt_datetime(
    columns = vars(datetime),
    date_style = 5,
    time_style = 3
  )