From 5040beff0bacac79b305fbfa4df71e99c2f13ed8 Mon Sep 17 00:00:00 2001
From: Michael Olson <mwolson@gnu.org>
Date: Mon, 15 Oct 2007 13:51:30 -0400
Subject: [PATCH] Documentation/git-tag.txt: Document how to backdate tags

Added a new section beneath "On Automatic following" called "On
Backdating Tags".  This includes an explanation of when to use this
method, a brief explanation of the kind of date that can be used in
GIT_AUTHOR_DATE, and an example invocation of git-tag using a custom
setting of GIT_AUTHOR_DATE.

[sp: Corrected s/you/your/, noticed by Jeff King]

Signed-off-by: Michael W. Olson <mwolson@gnu.org>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 Documentation/git-tag.txt | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index 22a23bf96..10d3e3fa9 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -214,6 +214,27 @@ having tracking branches.  Again, the heuristic to automatically
 follow such tags is a good thing.
 
 
+On Backdating Tags
+~~~~~~~~~~~~~~~~~~
+
+If you have imported some changes from another VCS and would like
+to add tags for major releases of your work, it is useful to be able
+to specify the date to embed inside of the tag object.  The data in
+the tag object affects, for example, the ordering of tags in the
+gitweb interface.
+
+To set the date used in future tag objects, set the environment
+variable GIT_AUTHOR_DATE to one or more of the date and time.  The
+date and time can be specified in a number of ways; the most common
+is "YYYY-MM-DD HH:MM".
+
+An example follows.
+
+------------
+$ GIT_AUTHOR_DATE="2006-10-02 10:31" git tag -s v1.0.1
+------------
+
+
 Author
 ------
 Written by Linus Torvalds <torvalds@osdl.org>,
-- 
2.26.2