Fix null date and datetime values that got stored like 0000-00-00. Good riddance!

frappe/model/base_document.py

@@ -173,6 +173,10 @@ class BaseDocument(object):
 		d = {}
 		for fieldname in self.meta.get_valid_columns():
 			d[fieldname] = self.get(fieldname)
+
+			if d[fieldname]=="" and self.meta.get_field(fieldname).fieldtype in ("Datetime", "Date"):
+				d[fieldname] = None
+
 		return d
 
 	def init_valid_columns(self):

frappe/patches.txt

@@ -70,4 +70,4 @@ frappe.patches.v5_0.bookmarks_to_stars
 frappe.patches.v5_0.style_settings_to_website_theme
 frappe.patches.v5_0.rename_ref_type_fieldnames
 frappe.patches.v5_0.fix_email_alert
-
+frappe.patches.v5_0.fix_null_date_datetime

frappe/patches/v5_0/fix_null_date_datetime.py

@@ -0,0 +1,20 @@
+from __future__ import unicode_literals
+import frappe
+
+def execute():
+	for table in frappe.db.get_tables():
+		changed = False
+		desc = frappe.db.sql("desc `{table}`".format(table=table), as_dict=True)
+		for field in desc:
+			if field["Type"] == "date":
+				frappe.db.sql("""update `{table}` set `{fieldname}`=null where `{fieldname}`='0000-00-00'""".format(
+					table=table, fieldname=field["Field"]))
+				changed = True
+
+			elif field["Type"] == "datetime(6)":
+				frappe.db.sql("""update `{table}` set `{fieldname}`=null where `{fieldname}`='0000-00-00 00:00:00.000000'""".format(
+					table=table, fieldname=field["Field"]))
+				changed = True
+
+		if changed:
+			frappe.db.commit()

frappe/utils/data.py

@@ -19,6 +19,10 @@ def getdate(string_date):
 	"""
 		 Coverts string date (yyyy-mm-dd) to datetime.date object
 	"""
+	# dateutil parser does not agree with dates like 0000-00-00
+	if not string_date or string_date=="0000-00-00":
+		return None
+
 	if isinstance(string_date, datetime.datetime):
 		return string_date.date()
 
@@ -28,6 +32,10 @@ def getdate(string_date):
 	return parser.parse(string_date).date()
 
 def get_datetime(datetime_str):
+	# dateutil parser does not agree with dates like 0000-00-00
+	if not datetime_str or (datetime_str or "").startswith("0000-00-00"):
+		return None
+
 	if isinstance(datetime_str, (datetime.datetime, datetime.timedelta)):
 		return datetime_str