make invoice_date a datefield not a datetimefield

src/economy/migrations/0006_auto_20190120_1642.py

@@ -0,0 +1,23 @@
+# Generated by Django 2.1.3 on 2019-01-20 15:42
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('economy', '0005_auto_20190120_1532'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='expense',
+            name='invoice_date',
+            field=models.DateField(blank=True, help_text='The invoice date for this Expense. This must match the invoice date on the documentation uploaded below.', null=True),
+        ),
+        migrations.AlterField(
+            model_name='revenue',
+            name='invoice_date',
+            field=models.DateField(blank=True, help_text='The invoice date for this Revenue. This must match the invoice date on the documentation uploaded below.', null=True),
+        ),
+    ]

src/economy/models.py

@@ -45,7 +45,7 @@ class Revenue(CampRelatedModel, UUIDModel):
         upload_to='revenues/',
     )
 
-    invoice_date = models.DateTimeField(
+    invoice_date = models.DateField(
         help_text='The invoice date for this Revenue. This must match the invoice date on the documentation uploaded below.',
         blank=True,
         null=True,
@@ -168,7 +168,7 @@ class Expense(CampRelatedModel, UUIDModel):
         upload_to='expenses/',
     )
 
-    invoice_date = models.DateTimeField(
+    invoice_date = models.DateField(
         help_text='The invoice date for this Expense. This must match the invoice date on the documentation uploaded below.',
         blank=True,
         null=True,