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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Date/Time Support</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="Appendixes" HREF="appendixes.html"><LINK REL="PREVIOUS" TITLE="PostgreSQL Error Codes" HREF="errcodes-appendix.html"><LINK REL="NEXT" TITLE="Date/Time Input Interpretation" HREF="datetime-input-rules.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="APPENDIX" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="PostgreSQL Error Codes" HREF="errcodes-appendix.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="appendixes.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="Date/Time Input Interpretation" HREF="datetime-input-rules.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="APPENDIX" ><H1 ><A NAME="DATETIME-APPENDIX" ></A >Appendix B. Date/Time Support</H1 ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT >B.1. <A HREF="datetime-input-rules.html" >Date/Time Input Interpretation</A ></DT ><DT >B.2. <A HREF="datetime-keywords.html" >Date/Time Key Words</A ></DT ><DT >B.3. <A HREF="datetime-config-files.html" >Date/Time Configuration Files</A ></DT ><DT >B.4. <A HREF="datetime-units-history.html" >History of Units</A ></DT ></DL ></DIV ><P > <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > uses an internal heuristic parser for all date/time input support. Dates and times are input as strings, and are broken up into distinct fields with a preliminary determination of what kind of information can be in the field. Each field is interpreted and either assigned a numeric value, ignored, or rejected. The parser contains internal lookup tables for all textual fields, including months, days of the week, and time zones. </P ><P > This appendix includes information on the content of these lookup tables and describes the steps used by the parser to decode dates and times. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="errcodes-appendix.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="datetime-input-rules.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > Error Codes</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="appendixes.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Date/Time Input Interpretation</TD ></TR ></TABLE ></DIV ></BODY ></HTML >