[symboleditor/release-2.0.0] doc: doc: Write docbook date in standard format

[Alexander Potashev]

Git commit 85f37656f6efec9c37472cc42b4750a824fa9214 by Alexander Potashev.
Committed on 12/06/2019 at 20:48.
Pushed by aspotashev into branch 'release-2.0.0'.

doc: Write docbook date in standard format

M  +1    -1    doc/index.docbook

https://commits.kde.org/symboleditor/85f37656f6efec9c37472cc42b4750a824fa9214

diff --git a/doc/index.docbook b/doc/index.docbook
index cc63d7f..fd22ecb 100644
--- a/doc/index.docbook
+++ b/doc/index.docbook
@@ -29,7 +29,7 @@
             <holder>Stephen P. Allewell</holder>
         </copyright>
         <legalnotice>&FDLNotice;</legalnotice>
-        <date>27/07/2015</date>
+        <date>2015-07-27</date>
         <releaseinfo>V.2.0.0</releaseinfo>
         <abstract>
             <para>