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Interval Functions

This section describes functions and operators for examining and manipulating `INTERVAL` values.

## Interval Operators

The table below shows the available mathematical operators for `INTERVAL` types.

Operator | Description | Example | Result
--- | --- | --- | ---
`+` | addition of an `INTERVAL` | `INTERVAL 1 HOUR + INTERVAL 5 HOUR` | `INTERVAL 6 HOUR`
`+` | addition to a `DATE` | `DATE '1992-03-22' + INTERVAL 5 DAY` | `1992-03-27`
`+` | addition to a `TIMESTAMP` | `TIMESTAMP '1992-03-22 01:02:03' + INTERVAL 5 DAY` | `1992-03-27 01:02:03`
`+` | addition to a `TIME` | `TIME '01:02:03' + INTERVAL 5 HOUR` | `06:02:03`
`-` | subtraction of an `INTERVAL` | `INTERVAL 5 HOUR - INTERVAL 1 HOUR` | `INTERVAL 4 HOUR`
`-` | subtraction from a `DATE` | `DATE '1992-03-27' - INTERVAL 5 DAY` | `1992-03-22`
`-` | subtraction from a `TIMESTAMP` | `TIMESTAMP '1992-03-27 01:02:03' - INTERVAL 5 DAY` | `1992-03-22 01:02:03`
`-` | subtraction from a `TIME` | `TIME '06:02:03' - INTERVAL 5 HOUR` | `01:02:03`

## Interval Functions

The table below shows the available scalar functions for `INTERVAL` types.

Name | Description
--- | ---
`date_part(part, interval)` | Extract datepart component (equivalent to `extract`). See `INTERVAL` for the sometimes surprising rules governing this extraction.
`datepart(part, interval)` | Alias of `date_part`.
`extract(part FROM interval)` | Alias of `date_part`.
`epoch(interval)` | Get total number of seconds, as double precision floating point number, in interval.
`to_centuries(integer)` | Construct a century interval.
`to_days(integer)` | Construct a day interval.
`to_decades(integer)` | Construct a decade interval.
`to_hours(integer)` | Construct a hour interval.
`to_microseconds(integer)` | Construct a microsecond interval.
`to_millennia(integer)` | Construct a millennium interval.
`to_milliseconds(integer)` | Construct a millisecond interval.
`to_minutes(integer)` | Construct a minute interval.
`to_months(integer)` | Construct a month interval.
`to_seconds(integer)` | Construct a second interval.
`to_weeks(integer)` | Construct a week interval.
`to_years(integer)` | Construct a year interval.

> Only the documented date part components are defined for intervals.

#### `date_part(part, interval)`

Description | Extract datepart component (equivalent to `extract`). See `INTERVAL` for the sometimes surprising rules governing this extraction.
Example | `date_part('year', INTERVAL '14 months')`
Result | `1`

#### `datepart(part, interval)`

Description | Alias of `date_part`.
Example | `datepart('year', INTERVAL '14 months')`
Result | `1`

#### `extract(part FROM interval)`

Description | Alias of `date_part`.
Example | `extract('month' FROM INTERVAL '14 months')`
Result | 2

#### `epoch(interval)`

Description | Get total number of seconds, as double precision floating point number, in interval.
Example | `epoch(INTERVAL 5 HOUR)`
Result | `18000.0`

#### `to_centuries(integer)`

Description | Construct a century interval.
Example | `to_centuries(5)`
Result | `INTERVAL 500 YEAR`

#### `to_days(integer)`

Description | Construct a day interval.
Example | `to_days(5)`
Result | `INTERVAL 5 DAY`

#### `to_decades(integer)`

Description | Construct a decade interval.
Example | `to_decades(5)`
Result | `INTERVAL 50 YEAR`

#### `to_hours(integer)`

Description | Construct a hour interval.
Example | `to_hours(5)`
Result | `INTERVAL 5 HOUR`

#### `to_microseconds(integer)`

Description | Construct a microsecond interval.
Example | `to_microseconds(5)`
Result | `INTERVAL 5 MICROSECOND`

#### `to_millennia(integer)`

Description | Construct a millennium interval.
Example | `to_millennia(5)`
Result | `INTERVAL 5000 YEAR`

#### `to_milliseconds(integer)`

Description | Construct a millisecond interval.
Example | `to_milliseconds(5)`
Result | `INTERVAL 5 MILLISECOND`

#### `to_minutes(integer)`

Description | Construct a minute interval.
Example | `to_minutes(5)`
Result | `INTERVAL 5 MINUTE`

#### `to_months(integer)`

Description | Construct a month interval.
Example | `to_months(5)`
Result | `INTERVAL 5 MONTH`

#### `to_seconds(integer)`

Description | Construct a second interval.
Example | `to_seconds(5)`
Result | `INTERVAL 5 SECOND`

#### `to_weeks(integer)`

Description | Construct a week interval.
Example | `to_weeks(5)`
Result | `INTERVAL 35 DAY`

#### `to_years(integer)`

Description | Construct a year interval.
Example | `to_years(5)`
Result | `INTERVAL 5 YEAR`

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