Format input date values that are either of the Date type, or, are character-based and expressed according to the ISO 8601 date format (YYYY-MM-DD). Once the appropriate data cells are targeted with columns (and, optionally, rows), we can simply apply a preset date style to format the dates. The following date styles are available for simpler formatting of ISO dates (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": 00/02/29

We can use the info_date_style() function for a useful reference on all of the possible inputs to date_style.

fmt_date(data, columns, rows = everything(), date_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 c(), 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(), num_range(), and everything().

rows

Optional rows to format. Providing either everything() (the default) or TRUE results in all rows in columns being formatted. Can either be a vector of row captions provided in 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(), num_range(), 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, or, provide a named date style ("wday_month_day_year", "m_day_year", "year.mn.day", etc.). Use info_date_style() to see the different numbered and named date 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). 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

3-8

See also

Examples

# Use `exibble` to create a gt table;
# keep only the `date` and `time` columns;
# format the `date` column to have
# dates formatted as `month_day_year`
# (date style `5`)
tab_1 <-
  exibble %>%
  dplyr::select(date, time) %>%
  gt() %>%
  fmt_date(
    columns = date,
    date_style = 5
  )

# Use `exibble` to create a gt table;
# keep only the `date` and `time` columns;
# format the `date` column to have mixed
# date formats (dates after April will
# be different than the others)
tab_2 <-
  exibble %>%
  dplyr::select(date, time) %>%
  gt() %>%
  fmt_date(
    columns = date,
    rows =
      as.Date(date) > as.Date("2015-04-01"),
    date_style = "m_day_year"
  ) %>%
  fmt_date(
    columns = date,
    rows =
      as.Date(date) <= as.Date("2015-04-01"),
    date_style = "day_m_year"
  )