diff --git a/common/fields.py b/common/fields.py
index 04a2e7b..4f1593c 100644
--- a/common/fields.py
+++ b/common/fields.py
@@ -1,5 +1,24 @@
 from django.db import models
-from django.core.validators import MinValueValidator, MaxValueValidator
+from django.core.validators import MinValueValidator, MaxValueValidator, validate_comma_separated_integer_list
+
+from multiselectfield import MultiSelectField
+
+class WeekdayChoices(models.IntegerChoices):
+    MONDAY = 0, "Monday"
+    TUESDAY = 1, "Tuesday"
+    WEDNESDAY = 2, "Wednesday"
+    THURSDAY = 3, "Thursday"
+    FRIDAY = 4, "Friday"
+    SATURDAY = 5, "Saturday"
+    SUNDAY = 6, "Sunday"
 
 class PercentageField(models.FloatField):
-    default_validators = [MaxValueValidator(100), MinValueValidator(0)]
\ No newline at end of file
+    default_validators = [MaxValueValidator(100), MinValueValidator(0)]
+
+class WeekdayField(MultiSelectField):
+    def __init__(self, *args, **kwargs):
+        self.choices = WeekdayChoices.choices
+        super().__init__(*args, **kwargs)
+
+class DayOfMonthField(models.PositiveIntegerField):
+    default_validators = [MinValueValidator(1), MaxValueValidator(31)]
\ No newline at end of file
diff --git a/habits/models.py b/habits/models.py
index 71a8362..5cba07a 100644
--- a/habits/models.py
+++ b/habits/models.py
@@ -1,3 +1,44 @@
 from django.db import models
+from django.utils import timezone
+
+from colorfield.fields import ColorField
+from polymorphic.models import PolymorphicModel
+from dateutil.relativedelta import relativedelta
+
+from common.fields import WeekdayField, DayOfMonthField
 
 # Create your models here.
+
+class Habit(models.Model):
+    name = models.CharField(max_length=64)
+    icon = models.CharField(default="fas fa-user-clock", max_length=64)
+    color = ColorField(default="#000000")
+    description = models.TextField(null=True, blank=True)
+    active = models.BooleanField(default=True)
+
+class HabitSchedule(PolymorphicModel):
+    habit = models.ForeignKey(Habit, models.CASCADE)
+
+    @property
+    def next_scheduled(self, today=True, now=timezone.now()):
+        raise NotImplementedError("%s does not implement next_scheduled." % self.__class__)
+
+class MonthlyHabitSchedule(HabitSchedule):
+    day = DayOfMonthField()
+
+    @property
+    def next_scheduled(self, today=True, now=timezone.now()):
+        if self.day < now.day:
+            date = now.replace(day=self.day) + relativedelta(months=1)
+        elif self.day == now.day:
+            date = now if today else now + relativedelta(months=1)
+        else:
+            date = now + relativedelta(day=self.day)
+
+        return date.date()
+
+class WeeklyHabitSchedule(HabitSchedule):
+    weekdays = WeekdayField()
+
+class DailyHabitSchedule(HabitSchedule):
+    pass
diff --git a/kumify/settings.py b/kumify/settings.py
index 76f005f..34b9f9b 100644
--- a/kumify/settings.py
+++ b/kumify/settings.py
@@ -15,6 +15,7 @@ INSTALLED_APPS = [
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'colorfield',
+    'multiselectfield',
     'dbsettings',
     'common',
     'frontend',
diff --git a/requirements.txt b/requirements.txt
index 44b7f55..d19b323 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,10 +4,13 @@ django[mysql]
 django-colorfield
 django-multiupload
 django-storages
+django-polymorphic
+django-multiselectfield
 git+git://github.com/Chive/django-multiupload.git@ba52e161a68ce19062c3655e89544c2d377990a0#egg=multiupload
 git+https://kumig.it/kumisystems/django-dbsettings.git
 git+https://kumig.it/kumisystems/django-filtersignals.git
 mysqlclient
 boto3
 argon2_cffi
-python-telegram-bot
\ No newline at end of file
+python-telegram-bot
+python-dateutil