Calculate minimum and maximum date and time in the data frame

Source: R/cal_min_max_date.R

This function derives the earliest/latest date as ISO8601 datetime

cal_min_max_date(
  raw_dataset,
  date_variable,
  time_variable,
  val_type = "min",
  date_format,
  time_format
)

Arguments

raw_dataset

Raw source data frame

date_variable

Single character string. Name of the date variable

time_variable

Single character string. Name of the time variable

val_type

Single character string determining whether to look for the earliest or the latest datetime combination. Permitted values: "min", "max". Default to "min".

date_format

Format of source date variable

time_format

Format of source time variable

Value

Data frame with 2 columns: unique patient_number and datetime variable column storing the earliest/latest datetime.

Examples

ex_raw <- tibble::tribble(
  ~patient_number,    ~EX_ST_DT, ~EX_ST_TM,
  "001",           "25-04-2022",   "10:20",
  "001",           "25-04-2022",   "10:15",
  "001",           "25-04-2022",   "10:19",
  "002",           "26-05-2022", "UNK:UNK",
  "002",           "26-05-2022",   "05:59"
)

min <- cal_min_max_date(ex_raw,
  date_variable = "EX_ST_DT",
  time_variable = "EX_ST_TM",
  val_type = "min",
  date_format = "dd-mmm-yyyy",
  time_format = "H:M"
)

max <- cal_min_max_date(ex_raw,
  date_variable = "EX_ST_DT",
  time_variable = "EX_ST_TM",
  val_type = "max",
  date_format = "dd-mmm-yyyy",
  time_format = "H:M"
)