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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Appendix B. Date/Time Support</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="errcodes-appendix.html" title="Appendix A. PostgreSQL Error Codes" /><link rel="next" href="datetime-input-rules.html" title="B.1. Date/Time Input Interpretation" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Appendix B. Date/Time Support</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="errcodes-appendix.html" title="Appendix A. PostgreSQL Error Codes">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="appendixes.html" title="Part VIII. Appendixes">Up</a></td><th width="60%" align="center">Part VIII. Appendixes</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="datetime-input-rules.html" title="B.1. Date/Time Input Interpretation">Next</a></td></tr></table><hr /></div><div class="appendix" id="DATETIME-APPENDIX"><div class="titlepage"><div><div><h2 class="title">Appendix B. Date/Time Support</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="datetime-input-rules.html">B.1. Date/Time Input Interpretation</a></span></dt><dt><span class="sect1"><a href="datetime-invalid-input.html">B.2. Handling of Invalid or Ambiguous Timestamps</a></span></dt><dt><span class="sect1"><a href="datetime-keywords.html">B.3. Date/Time Key Words</a></span></dt><dt><span class="sect1"><a href="datetime-config-files.html">B.4. Date/Time Configuration Files</a></span></dt><dt><span class="sect1"><a href="datetime-posix-timezone-specs.html">B.5. <acronym class="acronym">POSIX</acronym> Time Zone Specifications</a></span></dt><dt><span class="sect1"><a href="datetime-units-history.html">B.6. History of Units</a></span></dt><dt><span class="sect1"><a href="datetime-julian-dates.html">B.7. Julian Dates</a></span></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 /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="errcodes-appendix.html" title="Appendix A. PostgreSQL Error Codes">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="appendixes.html" title="Part VIII. Appendixes">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="datetime-input-rules.html" title="B.1. Date/Time Input Interpretation">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Appendix A. <span class="productname">PostgreSQL</span> Error Codes </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> B.1. Date/Time Input Interpretation</td></tr></table></div></body></html>
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