Categories:

Date & time functions

DATE_PART

Extracts the specified date or time part from a date, time, or timestamp.

Alternatives:

EXTRACT , HOUR / MINUTE / SECOND , YEAR* / DAY* / WEEK* / MONTH / QUARTER

Syntax

DATE_PART( <date_or_time_part> , <date_time_or_timestamp_expr> )
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DATE_PART( <date_or_time_part> FROM <date_time_or_timestamp_expr> )
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Arguments

date_or_time_part

The unit of time. Must be one of the values listed in Supported date and time parts (e.g. month). The value can be a string literal or can be unquoted (for example, 'month' or month).

  • When date_or_time_part is week (or any of its variations), the output is controlled by the WEEK_START session parameter.

  • When date_or_time_part is dayofweek or yearofweek (or any of their variations), the output is controlled by the WEEK_OF_YEAR_POLICY and WEEK_START session parameters.

For more information, including examples, see Calendar weeks and weekdays.

date_time_or_timestamp_expr

A date, a time, or a timestamp, or an expression that can be evaluated to a date, a time, or a timestamp.

Returns

Returns a value of NUMBER data type.

Usage notes

Currently, when date_or_timestamp_expr is a DATE value, the following date_or_time_part values are not supported:

  • epoch_millisecond

  • epoch_microsecond

  • epoch_nanosecond

Other date and time parts (including epoch_second) are supported.

Tip

To extract a full DATE or TIME value instead of a single part from a TIMESTAMP value, you can cast the TIMESTAMP value to a DATE or TIME value, respectively. For example:

SELECT '2025-04-08T23:39:20.123-07:00'::TIMESTAMP::DATE AS full_date_value;
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+-----------------+ | FULL_DATE_VALUE | |-----------------| | 2025-04-08 | +-----------------+ 
SELECT '2025-04-08T23:39:20.123-07:00'::TIMESTAMP::TIME AS full_time_value;
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+-----------------+ | FULL_TIME_VALUE | |-----------------| | 23:39:20 | +-----------------+

Examples

This shows a simple example of extracting part of a DATE:

SELECT DATE_PART(quarter, '2024-04-08'::DATE);
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+----------------------------------------+ | DATE_PART(QUARTER, '2024-04-08'::DATE) | |----------------------------------------| | 2 | +----------------------------------------+

This shows an example of extracting part of a TIMESTAMP:

SELECT TO_TIMESTAMP( '2024-04-08T23:39:20.123-07:00') AS "TIME_STAMP1", DATE_PART(year, "TIME_STAMP1") AS "EXTRACTED YEAR";
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+-------------------------+----------------+ | TIME_STAMP1 | EXTRACTED YEAR | |-------------------------+----------------| | 2024-04-08 23:39:20.123 | 2024 | +-------------------------+----------------+

This shows an example of converting a TIMESTAMP to the number of seconds since the beginning of the Unix epoch (midnight January 1, 1970):

SELECT TO_TIMESTAMP( '2024-04-08T23:39:20.123-07:00') AS "TIME_STAMP1", DATE_PART(epoch_second, "TIME_STAMP1") AS "EXTRACTED EPOCH SECOND";
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+-------------------------+------------------------+ | TIME_STAMP1 | EXTRACTED EPOCH SECOND | |-------------------------+------------------------| | 2024-04-08 23:39:20.123 | 1712619560 | +-------------------------+------------------------+

This shows an example of converting a TIMESTAMP to the number of milliseconds since the beginning of the Unix epoch (midnight January 1, 1970):

SELECT TO_TIMESTAMP( '2024-04-08T23:39:20.123-07:00') AS "TIME_STAMP1", DATE_PART(epoch_millisecond, "TIME_STAMP1") AS "EXTRACTED EPOCH MILLISECOND";
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+-------------------------+-----------------------------+ | TIME_STAMP1 | EXTRACTED EPOCH MILLISECOND | |-------------------------+-----------------------------| | 2024-04-08 23:39:20.123 | 1712619560123 | +-------------------------+-----------------------------+
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