[gnome-calendar] week-header: Use GDateTime to fetch weekday names

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit f67009bbba877a948ce59f8a8882e61e1f1f2794
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Apr 26 16:00:33 2019 -0300

    week-header: Use GDateTime to fetch weekday names

 src/views/gcal-week-header.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/src/views/gcal-week-header.c b/src/views/gcal-week-header.c
index 04b79b4b..a50f8da0 100644
--- a/src/views/gcal-week-header.c
+++ b/src/views/gcal-week-header.c
@@ -1295,6 +1295,7 @@ gcal_week_header_draw (GtkWidget      *widget,
 
   for (i = 0; i < 7; i++)
     {
+      g_autoptr (GDateTime) day = NULL;
       WeatherInfoDay *wdinfo; /* unowned */
       gchar *weekday_date, *weekday_abv, *weekday;
       gdouble x;
@@ -1302,7 +1303,8 @@ gcal_week_header_draw (GtkWidget      *widget,
       gint font_width;
       gint n_day;
 
-      n_day = g_date_time_get_day_of_month (week_start) + i;
+      day = g_date_time_add_days (week_start, i);
+      n_day = g_date_time_get_day_of_month (day);
 
       if (n_day > g_date_get_days_in_month (g_date_time_get_month (week_start), g_date_time_get_year 
(week_start)))
         n_day = n_day - g_date_get_days_in_month (g_date_time_get_month (week_start), g_date_time_get_year 
(week_start));
@@ -1337,8 +1339,8 @@ gcal_week_header_draw (GtkWidget      *widget,
       gtk_style_context_restore (context);
 
       /* Draws the days name */
-      weekday = g_utf8_strup (gcal_get_weekday ((i + self->first_weekday) % 7), -1);
-      weekday_abv = g_strdup (weekday);
+      weekday = g_date_time_format (day, "%a");
+      weekday_abv = g_utf8_strup (weekday, -1);
       g_free (weekday);
 
       gtk_style_context_save (context);