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Date and Time Functions
=======================
.. toctree::
:hidden:
current_date
extract_date
date_trunc
Current
-------
+--------------------------+-------------------------------------+-----------------------------------------------------------------+
|Name |Return Type |Description |
+==========================+=====================================+=================================================================+
|current_date |date |Current date |
+--------------------------+-------------------------------------+-----------------------------------------------------------------+
|current_time |time with time zone |Current time of day |
+--------------------------+-------------------------------------+-----------------------------------------------------------------+
|current_timestamp |timestamp with time zone |Current date and time (start of current transaction) |
+--------------------------+-------------------------------------+-----------------------------------------------------------------+
|localtime |time |Current time of day |
+--------------------------+-------------------------------------+-----------------------------------------------------------------+
|localtimestamp |timestamp |Current date and time (start of current transaction) |
+--------------------------+-------------------------------------+-----------------------------------------------------------------+
|now() |timestamp with time zone |Current date and time (start of current transaction) |
+--------------------------+-------------------------------------+-----------------------------------------------------------------+
|statement_timestamp() |timestamp with time zone |Current date and time (start of current statement) |
+--------------------------+-------------------------------------+-----------------------------------------------------------------+
|timeofday() |text |Current date and time (as a text string) |
+--------------------------+-------------------------------------+-----------------------------------------------------------------+
Extract
-------
+--------------------------------+-----------------------+---------------------------------------+
|Name |Return Type |Description |
+================================+=======================+=======================================+
|extract(field from timestamp) |double precision |Get subfield |
+--------------------------------+-----------------------+---------------------------------------+
|extract(field from interval) |double precision |Get subfield |
+--------------------------------+-----------------------+---------------------------------------+
|date_part(text, timestamp) |double precision |Get subfield (equivalent to extract) |
+--------------------------------+-----------------------+---------------------------------------+
|date_part(text, interval) |double precision |Get subfield (equivalent to extract) |
+--------------------------------+-----------------------+---------------------------------------+
date_trunc
----------
+--------------------------------+-----------------------+---------------------------------------+
|Name |Return Type |Description |
+================================+=======================+=======================================+
|date_trunc(text, timestamp) |timestamp |Truncate to specified precision |
+--------------------------------+-----------------------+---------------------------------------+
|