Narrow: year-month-day

This is a year-month-day method for the calendar_narrow() generic. It narrows a year-month-day vector to the specified precision.

Usage

# S3 method for class 'clock_year_month_day'
calendar_narrow(x, precision)

Arguments

x

[clock_year_month_day]

A year-month-day vector.

precision

[character(1)]

One of:

• "year"

• "month"

• "day"

• "hour"

• "minute"

• "second"

• "millisecond"

• "microsecond"

• "nanosecond"

Value

x narrowed to the supplied precision.

Examples

# Hour precision
x <- year_month_day(2019, 1, 3, 4)
x
#> <year_month_day<hour>[1]>
#> [1] "2019-01-03T04"

# Narrowed to day precision
calendar_narrow(x, "day")
#> <year_month_day<day>[1]>
#> [1] "2019-01-03"

# Or month precision
calendar_narrow(x, "month")
#> <year_month_day<month>[1]>
#> [1] "2019-01"

# Subsecond precision can be narrowed to second precision
milli <- calendar_widen(x, "millisecond")
micro <- calendar_widen(x, "microsecond")
milli
#> <year_month_day<millisecond>[1]>
#> [1] "2019-01-03T04:00:00.000"
micro
#> <year_month_day<microsecond>[1]>
#> [1] "2019-01-03T04:00:00.000000"

calendar_narrow(milli, "second")
#> <year_month_day<second>[1]>
#> [1] "2019-01-03T04:00:00"
calendar_narrow(micro, "second")
#> <year_month_day<second>[1]>
#> [1] "2019-01-03T04:00:00"

# But once you have "locked in" a subsecond precision, it can't be
# narrowed to another subsecond precision
try(calendar_narrow(micro, "millisecond"))
#> Error in calendar_narrow(micro, "millisecond") : 
#>   Can't narrow a subsecond precision `x` ("microsecond") to another
#> subsecond precision ("millisecond").