Durations

A duration represents a non-negative period of time.

Duration units

Durations can be specified in any of the following units:

Creating and using durations

A duration can be composed of any number of duration units.

1y40w20h;

A duration that contains multiple instances of the same unit type will parse as well, combining lesser units into greater units when a maximum value is reached.

For example, a duration that includes 12h two times will be evaluated as 1d.

1d1d12h12h;
-- 3d

A duration can also be created by casting a string.

<duration>"1d1d12h12h";
-- 3d

A duration can be zero, but cannot be negative.

0ns;
0d; -- Evaluates to 0ns

The maximum possible duration can be accessed via the const duration::max, above which a duration cannot be formed.

duration::max;
-- 584942417355y3w5d7h15s999ms999µs999ns

duration::max + 1ns
-- 'Failed to compute: "584942417355y3w5d7h15s999ms999µs999ns + 1ns", as the operation results in an arithmetic overflow.'

Durations can be added to and subtracted from other durations as well as datetimes.

d'1970-01-01' + 1d;
-- d'1970-01-02T00:00:00Z'

1y - 6w;
46w1d;

Multiplying and dividing durations

A duration can be multiplied and divided by a number.

1d / 24;
-- 1h

1d * 5.5;
-- 5d12h