Create a datey aligned to the start, middle or end of the day specified by a fractional calendar year or another date type.

Accepted types are:

• Numeric, interpreted as calendar year, with the fractional part representing the fraction of the year. For instance, datey(2000.5) means halfway through the year 2000.

• The base R date types (Date and POSIXct and POSIXlt).

• character, in ISO 8601 extended format, i.e. YYYY-MM-DD.

• datey, which is interpreted as is but with the start, middle or end day override.

Beware that as_end_day() will add a day to a datey that is already on a day boundary, even if it was originally defined as an end day.

Usage

as_start_day(x, strict = TRUE)

as_mid_day(x, strict = TRUE)

as_end_day(x, strict = TRUE)

Arguments

x

The argument to convert to a datey.

strict

How invalid non-NA inputs should be handled. If strict is TRUE – the default – then execution is stopped. If strict is FALSE then NA is returned.

NA arguments result in NA (and do not stop execution) regardless of strict.

Value

A vector of datey.

See also

Use start_day(), mid_day() and end_day() to create a datey direct from year, month and day.

Examples

  R_date <- as.Date("2025-07-01")
  as_start_day(R_date)
#> [1] 2025-07-01.0
  as_mid_day(R_date)
#> [1] 2025-07-01.5
  as_end_day(R_date)
#> [1] 2025-07-02.0