Added Timer GUI element

entities/ui/Timer.gd

@@ -0,0 +1,42 @@
+extends Node2D
+
+# Time formatting stolen from 
+# https://godotengine.org/qa/32785/is-there-simple-way-to-convert-seconds-to-hh-mm-ss-format-godot
+
+enum TimeFormat {
+	FORMAT_HOURS   = 1 << 0,
+	FORMAT_MINUTES = 1 << 1,
+	FORMAT_SECONDS = 1 << 2,
+} 
+
+func format_time(time, format, digit_format = "%02d"):
+	var digits = []
+
+	if format & TimeFormat.FORMAT_HOURS:
+		var hours = digit_format % [time / 3600]
+		digits.append(hours)
+
+	if format & TimeFormat.FORMAT_MINUTES:
+		var minutes = digit_format % [time / 60]
+		digits.append(minutes)
+
+	if format & TimeFormat.FORMAT_SECONDS:
+		var seconds = digit_format % [int(ceil(time)) % 60]
+		digits.append(seconds)
+
+	var formatted = String()
+	var colon = " : "
+
+	for digit in digits:
+		formatted += digit + colon
+
+	if not formatted.empty():
+		formatted = formatted.rstrip(colon)
+
+	return formatted
+
+var time_elapsed = 0
+
+func _on_Timer_timeout():
+	time_elapsed += 1
+	$Label.text = format_time(time_elapsed, TimeFormat.FORMAT_MINUTES | TimeFormat.FORMAT_SECONDS)

entities/ui/Timer.tscn

@@ -0,0 +1,21 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://entities/ui/Timer.gd" type="Script" id=1]
+
+[node name="Node2D" type="Node2D"]
+script = ExtResource( 1 )
+
+[node name="Timer" type="Timer" parent="."]
+autostart = true
+
+[node name="Label" type="Label" parent="."]
+margin_left = 184.887
+margin_top = 114.274
+margin_right = 224.887
+margin_bottom = 128.274
+text = "0"
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[connection signal="timeout" from="Timer" to="." method="_on_Timer_timeout"]