[polari] chatview: fix timestamp formatting

[Giovanni Campagna <gcampagna src gnome org>]

commit e483304f461302f40ece1b0c1573baee2f6844c4
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Wed Jul 2 11:39:10 2014 +0200

    chatview: fix timestamp formatting
    
    We want to show "yesterday" when the day part of the date is
    different, even if less than 24 hours have passed. To do so,
    instead of computing the difference between the actual time
    points, use two reference points (located at 00:01) in the
    same day, that thus will be always different by an integer
    number of days.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=732611

 src/chatView.js |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/src/chatView.js b/src/chatView.js
index 2db075c..e821baa 100644
--- a/src/chatView.js
+++ b/src/chatView.js
@@ -559,7 +559,16 @@ const ChatView = new Lang.Class({
         let date = GLib.DateTime.new_from_unix_local(timestamp);
         let now = GLib.DateTime.new_now_local();
 
-        let daysAgo = now.difference(date) / GLib.TIME_SPAN_DAY;
+        // 00:01 actually, just to be safe
+        let todayMidnight = GLib.DateTime.new_local(now.get_year(),
+                                                    now.get_month(),
+                                                    now.get_day_of_month(),
+                                                    0, 1, 0);
+        let dateMidnight = GLib.DateTime.new_local(date.get_year(),
+                                                   date.get_month(),
+                                                   date.get_day_of_month(),
+                                                   0, 1, 0);
+        let daysAgo = todayMidnight.difference(dateMidnight) / GLib.TIME_SPAN_DAY;
 
         let format;
         let desktopSettings = new Gio.Settings({ schema: 'org.gnome.desktop.interface' });