docs: clarify that today/tomorrow/yesterday is at 00:00

This should help people clearly know that these days start at midnight.

Reported-by: David Harper
Discussion: https://postgr.es/m/156258047907.1181.11324468080514061996@wrigleys.postgresql.org

Backpatch-through: 9.4

diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index 35ecd48ed5d442e5dd43a0db8868d0c0232abc4e..ce9d2dddf11d502c9faadbf2601b4400120ea22b 100644 (file)
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -2174,17 +2174,17 @@ January 8 04:05:06 1999 PST
          <row>
           <entry><literal>today</literal></entry>
           <entry><type>date</type>, <type>timestamp</type></entry>
-          <entry>midnight today</entry>
+          <entry>midnight (<literal>00:00</literal>) today</entry>
          </row>
          <row>
           <entry><literal>tomorrow</literal></entry>
           <entry><type>date</type>, <type>timestamp</type></entry>
-          <entry>midnight tomorrow</entry>
+          <entry>midnight (<literal>00:00</literal>) tomorrow</entry>
          </row>
          <row>
           <entry><literal>yesterday</literal></entry>
           <entry><type>date</type>, <type>timestamp</type></entry>
-          <entry>midnight yesterday</entry>
+          <entry>midnight (<literal>00:00</literal>) yesterday</entry>
          </row>
          <row>
           <entry><literal>allballs</literal></entry>