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  • Committer: lbieber
  • Date: 2010-10-02 19:48:35 UTC
  • mfrom: (1730.6.19 drizzle-make-lcov)
  • Revision ID: lbieber@orisndriz08-20101002194835-q5zd9qc4lvx1xnfo
Merge Hartmut - clean up lex, now require flex to build, also "make lcov" improvements

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