Adjusts date format in mutt

mutt/.config/mutt/muttrc

@@ -65,7 +65,18 @@ set sort = threads # https://neomutt.org/guide/reference#sort
 # Sort threads by last date recieved - newest first
 set sort_aux = reverse-last-date-received # https://neomutt.org/guide/reference#sort_aux
 # Show date in year/month/day hour:minute format
-set date_format="%y/%m/%d %I:%M%p" # https://neomutt.org/guide/reference#date_format
+	# The default index_format is:
+	#       '%4C %Z %{%b %d} %-15.15L (%?l?%4l&%4c?) %s'
+	#
+	# We replace the date field '%{%b %d}', giving:
+set index_format='%4C %Z %<[y?%<[m?%<[d?%[%H:%M ]&%[%a %d]>&%[%b %d]>&%[%m/%y ]> %-15.15L (%?l?%4l&%4c?) %s'
+	# Test  Date Range  Format String  Example
+	# --------------------------------------------
+	# %[d   Today       %[%H:%M ]      12:34
+	# %[m   This month  %[%a %d]       Thu 12
+	# %[y   This year   %[%b %d]       Dec 10
+	#  —    Older       %[%m/%y ]      06/15
+
 # Vim like keybindings
 bind index G last-entry
 bind index g noop