gh-133125: Clarify ZipInfo.date_time attribute documentation

Doc/library/zipfile.rst

@@ -818,7 +818,18 @@ Instances have the following methods and attributes:
 .. attribute:: ZipInfo.date_time
 
    The time and date of the last modification to the archive member.  This is a
-   tuple of six values:
+   tuple of six values representing the "last mod file time" and "last mod file date"
+   fields from the ZIP file's central directory.
+
+   .. note::
+
+      The ZIP format supports multiple timestamp fields in different locations
+      (central directory, extra fields for NTFS/UNIX systems, etc.). This attribute
+      specifically returns the timestamp from the central directory. Future Python
+      versions may use alternative timestamp sources if they provide better accuracy
+      or precision.
+
+   The tuple contains:
 
    +-------+--------------------------+
    | Index | Value                    |
@@ -838,7 +849,10 @@ Instances have the following methods and attributes:
 
    .. note::
 
-      The ZIP file format does not support timestamps before 1980.
+      The central directory timestamp format in ZIP files does not support
+      timestamps before 1980. While some extra field formats (such as UNIX
+      timestamps) can represent earlier dates, this attribute only returns
+      the central directory timestamp.
 
 
 .. attribute:: ZipInfo.compress_type