These helpers construct durations of the specified precision. Durations represent units of time.
Durations are separated into two categories:
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.
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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())
The number of units of time to use when creating the duration.
A duration of the specified precision.
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
which can cast durations to any other precision, with a potential loss of
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