Adopt ISO date format.

Author: michaelrsweet

CHANGES.md

@@ -1,14 +1,14 @@
 Changes in libcups
 ==================
 
-libcups v3.0.0 (Month DD, YYYY)
--------------------------------
+libcups v3.0.0 (YYYY-MM-DD)
+---------------------------
 
 - Fixed the default User-Agent string sent in requests.
 
 
-libcups v3.0rc1 (September 20, 2024)
-------------------------------------
+libcups v3.0rc1 (2024-09-20)
+----------------------------
 
 - Added `cupsFormatString` and `cupsFormatStringv` APIs to safely format UTF-8
   strings.
@@ -49,8 +49,8 @@ libcups v3.0rc1 (September 20, 2024)
 - Fixed how `ippeveprinter` responds to an unsupported request character set.
 
 
-libcups v3.0b2 (October 5, 2023)
---------------------------------
+libcups v3.0b2 (2023-10-05)
+---------------------------
 
 - Added the `ipptransform` command to replace/upgrade the `ippevepcl` and
   `ippeveps` commands (Issue #65)
@@ -72,8 +72,8 @@ libcups v3.0b2 (October 5, 2023)
 - Fixed `CUPS_DNSSD_IF_INDEX_LOCAL` when using Avahi.
 
 
-libcups v3.0b1 (February 9, 2023)
----------------------------------
+libcups v3.0b1 (2023-02-09)
+---------------------------
 
 - Documentation updates (Issue #32)
 - Split out libcups and tools from CUPS 2.x.