fractional file timestamps in tramp-adb

[Paul Eggert <eggert@cs.ucla.edu>]

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The attached recently-installed patchchanges the tramp-adb's generated 
shell command from this format:

touch -t 201902141023.17 file

to this format:

touch -d 2019-02-14T18:23:17 file

A downside of the new approach is that it assumes POSIX.1-2008 or later, 
but I guess that's OK nowadays. An upside is that 'touch -d' lets one 
specify the fractional part of the timestamp, and also lets one specify 
that the timestamp is UTC by appending "Z" (I don't see how the current 
code is arranging for UTC). So, how about the attached followup patch? 
It would change the format to:

touch -d 2019-02-14T18:23:17.318491822Z file


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From 68d572c9b6869556f02ca1118025b94d27723aa4 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu, 14 Feb 2019 10:40:37 -0800
Subject: [PATCH] Add fractional file timestamps to tramp-adb

* lisp/net/tramp-adb.el (tramp-adb-handle-set-file-times):
Set fractional part of file timestamp too.  Specify UTC.
---
 lisp/net/tramp-adb.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/net/tramp-adb.el b/lisp/net/tramp-adb.el
index 22f2c5f6bf..5dbcf55067 100644
--- a/lisp/net/tramp-adb.el
+++ b/lisp/net/tramp-adb.el
@@ -680,7 +680,7 @@ tramp-adb-handle-set-file-times
 		  time)))
       (tramp-adb-send-command-and-check
        v (format "touch -d %s %s"
-		 (format-time-string "%Y-%m-%dT%H:%M:%S" time t)
+		 (format-time-string "%Y-%m-%dT%H:%M:%S.%NZ" time t)
 		 (tramp-shell-quote-argument localname))))))
 
 (defun tramp-adb-handle-copy-file
-- 
2.20.1