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Construct a duration

Source: R/duration.R
duration-helper.Rd

These helpers construct durations of the specified precision. Durations represent units of time.

Durations are separated into two categories:

Calendrical

  • year

  • quarter

  • month

Chronological

  • week

  • day

  • hour

  • minute

  • second

  • millisecond

  • microsecond

  • nanosecond

Calendrical durations are generally used when manipulating calendar types, like year-month-day. Chronological durations are generally used when working with time points, like sys-time or naive-time.

Usage

duration_years(n = integer())

duration_quarters(n = integer())

duration_months(n = integer())

duration_weeks(n = integer())

duration_days(n = integer())

duration_hours(n = integer())

duration_minutes(n = integer())

duration_seconds(n = integer())

duration_milliseconds(n = integer())

duration_microseconds(n = integer())

duration_nanoseconds(n = integer())

Arguments

n

[integer]

The number of units of time to use when creating the duration.

Value

A duration of the specified precision.

Internal Representation

Durations are internally represented as an integer number of "ticks" along with a ratio describing how it converts to a number of seconds. The following duration ratios are used in clock:

  • 1 year == 31556952 seconds

  • 1 quarter == 7889238 seconds

  • 1 month == 2629746 seconds

  • 1 week == 604800 seconds

  • 1 day == 86400 seconds

  • 1 hour == 3600 seconds

  • 1 minute == 60 seconds

  • 1 second == 1 second

  • 1 millisecond == 1 / 1000 seconds

  • 1 microsecond == 1 / 1000000 seconds

  • 1 nanosecond == 1 / 1000000000 seconds

A duration of 1 year is defined to correspond to the average length of a proleptic Gregorian year, i.e. 365.2425 days.

A duration of 1 month is defined as exactly 1/12 of a year.

A duration of 1 quarter is defined as exactly 1/4 of a year.

A duration of 1 week is defined as exactly 7 days.

These conversions come into play when doing operations like adding or flooring durations. Generally, you add two calendrical durations together to get a new calendrical duration, rather than adding a calendrical and a chronological duration together. The one exception is duration_cast(), which can cast durations to any other precision, with a potential loss of information.

Examples

duration_years(1:5)
#> <duration<year>[5]>
#> [1] 1 2 3 4 5
duration_nanoseconds(1:5)
#> <duration<nanosecond>[5]>
#> [1] 1 2 3 4 5