diff --git a/script/calendar.gd b/script/calendar.gd
index ff398be..6357be2 100644
--- a/script/calendar.gd
+++ b/script/calendar.gd
@@ -4,11 +4,9 @@ extends Control
 @export var month_scene: PackedScene
 
 @onready var year_label = $CenterContainer/VBoxContainer/YearLabel
-@onready var year = $CenterContainer/VBoxContainer/Year
-@onready var period_manager = $PeriodManager
+@onready var months = $CenterContainer/VBoxContainer/Months
 
 var last_focused_day = null
-var new_focused_day = null
 var all_days = []
 
 
@@ -24,20 +22,46 @@ func _ready():
 		month.month = i
 		month.day_toggled.connect(_on_day_toggled)
 		month.fill_days.connect(_on_fill_days)
-		year.add_child(month)
+		months.add_child(month)
+		
+	if FileAccess.file_exists("user://savegame.save"):
+		load_days()
+	
+	for month in months.get_children():
+		if month is Month:
+			for element in month.days.get_children():
+				if element is Day:
+					all_days.append(element)
 
-		for element in month.days.get_children():
-			if element is Day:
-				all_days.append(element)
+
+func load_days():
+	var save_game = FileAccess.open("user://savegame.save", FileAccess.READ)
+	while save_game.get_position() < save_game.get_length():
+		var json_string = save_game.get_line()
+		var json = JSON.new()
+		
+		var parse_result = json.parse(json_string)
+		if not parse_result == OK:
+			print("JSON parse error: %s in %s at line %s" % [json.get_error_message(), json_string, json.get_error_line()])
+			continue
+		
+		var node_data = json.get_data()
+		var month = get_month(node_data["month"])
+		month.instantiate_day(node_data["day"], node_data["is_pressed"])
+
+
+func get_month(month):
+	for child in months.get_children():
+		if child is Month and child.month == month:
+			return child
 
 
 func _on_day_toggled(date):
-	# period_manager.add(date)
-
 	# Update last focused day.
 	var focused_node = get_viewport().gui_get_focus_owner()
 	if focused_node is Day:
 		last_focused_day = focused_node
+	save()
 
 
 func _on_fill_days(shift_clicked_day):
@@ -64,4 +88,24 @@ func _on_fill_days(shift_clicked_day):
 		if toggle:
 			day.set_pressed_no_signal(true)
 		if last_day == day:
-			return
+			break
+	
+	save()
+
+
+func save():
+	var save_game = FileAccess.open("user://savegame.save", FileAccess.WRITE)
+	var saved_nodes = get_tree().get_nodes_in_group("persist")
+	
+	for node in saved_nodes:
+		if node.scene_file_path.is_empty():
+			print("persistant node '%s' is not an instanced scene, skipped" % node.name)
+			continue
+		
+		if !node.has_method("save"):
+			print("persistent node '%s' is missing a save() function, skipped" % node.name)
+			continue
+		
+		var node_data = node.call("save")
+		var json_string = JSON.stringify(node_data)
+		save_game.store_line(json_string)
diff --git a/script/day.gd b/script/day.gd
index cfe098b..a975c01 100644
--- a/script/day.gd
+++ b/script/day.gd
@@ -35,5 +35,14 @@ func is_before(other_day):
 	return false
 
 
+func save():
+	return {
+		"year": date.year,
+		"month": date.month,
+		"day": date.day,
+		"is_pressed": is_pressed()
+	}
+
+
 func dump():
 	print("%s - %s - %s" % [date.year, date.month, date.day])
diff --git a/script/month.gd b/script/month.gd
index fb24b2c..63748e7 100644
--- a/script/month.gd
+++ b/script/month.gd
@@ -11,7 +11,7 @@ var year: int
 var month: int
 
 @onready var month_label = $HBoxContainer/MonthLabel
-@onready var days = $HBoxContainer/DaysGridContainer
+@onready var days = $HBoxContainer/Days
 
 
 # Called when the node enters the scene tree for the first time.
@@ -26,13 +26,24 @@ func _ready():
 	for i in range(first_day.weekday):
 		var empty_label = Label.new()
 		days.add_child(empty_label)
+	
+	# Instanciate days in no save game
+	if FileAccess.file_exists("user://savegame.save"):
+		return
+		
 	for i in range(1, days_in_month + 1):
-		var day = day_scene.instantiate()
-		day.set_date(year, month, i)
-		day.text = "%s" % [i]
-		day.day_toggled.connect(_on_day_toggled)
-		day.fill_days.connect(_on_fill_days)
-		days.add_child(day)
+		instantiate_day(i, false)
+
+
+func instantiate_day(day, is_pressed):
+	var new_day = day_scene.instantiate()
+	days.add_child(new_day)
+	new_day.set_date(year, month, day)
+	new_day.text = "%s" % [day]
+	new_day.day_toggled.connect(_on_day_toggled)
+	new_day.fill_days.connect(_on_fill_days)
+	new_day.set_pressed_no_signal(is_pressed)
+	new_day.add_to_group("persist")
 
 
 func _on_day_toggled(date):
diff --git a/script/period.gd b/script/period.gd
deleted file mode 100644
index 528a39f..0000000
--- a/script/period.gd
+++ /dev/null
@@ -1,5 +0,0 @@
-class_name Period
-extends Node
-
-var begin = {}
-var end = {}
diff --git a/script/periodmanager.gd b/script/periodmanager.gd
deleted file mode 100644
index 331153b..0000000
--- a/script/periodmanager.gd
+++ /dev/null
@@ -1,24 +0,0 @@
-extends Node
-
-var periods = []
-var last_period = null
-
-
-func add(date):
-	if last_period != null:
-		last_period.end = date
-		last_period = null
-		dump()
-		return
-
-	# If no new period has begun
-	var period = Period.new()
-	period.begin = date
-	periods.append(period)
-	last_period = period
-	dump()
-
-
-func dump():
-	for period in periods:
-		print("%s - %s" % [period.begin, period.end])