diff --git a/backend/app/alembic/versions/e6b42c5752d5_changed_all_date_to_string.py b/backend/app/alembic/versions/e6b42c5752d5_changed_all_date_to_string.py
new file mode 100644
index 0000000..a98b79f
--- /dev/null
+++ b/backend/app/alembic/versions/e6b42c5752d5_changed_all_date_to_string.py
@@ -0,0 +1,43 @@
+"""changed all date to string
+
+Revision ID: e6b42c5752d5
+Revises: 691c39dbac74
+Create Date: 2024-10-07 14:52:05.314791
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'e6b42c5752d5'
+down_revision = '691c39dbac74'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('course', 'created_at',
+               existing_type=postgresql.TIMESTAMP(),
+               type_=sqlmodel.sql.sqltypes.AutoString(),
+               existing_nullable=False)
+    op.alter_column('message', 'created_at',
+               existing_type=postgresql.TIMESTAMP(),
+               type_=sqlmodel.sql.sqltypes.AutoString(),
+               existing_nullable=False)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('message', 'created_at',
+               existing_type=sqlmodel.sql.sqltypes.AutoString(),
+               type_=postgresql.TIMESTAMP(),
+               existing_nullable=False)
+    op.alter_column('course', 'created_at',
+               existing_type=sqlmodel.sql.sqltypes.AutoString(),
+               type_=postgresql.TIMESTAMP(),
+               existing_nullable=False)
+    # ### end Alembic commands ###
diff --git a/backend/app/models.py b/backend/app/models.py
index e5c4f77..d11bdfe 100644
--- a/backend/app/models.py
+++ b/backend/app/models.py
@@ -124,7 +124,7 @@ class MessageBase(SQLModel):
     
 class Message(MessageBase, table=True):
     id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
-    created_at: datetime = Field(default_factory=datetime.now)
+    created_at: str = Field(default_factory=datetime.now)
     
 class MessageCreate(MessageBase):
     pass
@@ -201,7 +201,7 @@ class CourseUpdate(CourseBase):
 
 class Course(CourseBase, table=True):
     id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
-    created_at: datetime = Field(default_factory=datetime.now)
+    created_at: str = Field(default_factory=datetime.now)
     images: list["Image"] =  Relationship(back_populates="course", cascade_delete=True)
     info_images: list["Info_Image"] =  Relationship(back_populates="course", cascade_delete=True)
     schedule: list["Schedule"] =  Relationship(back_populates="course", cascade_delete=True)
@@ -212,7 +212,7 @@ class CoursePublic(CourseBase):
     images: list["Image"] 
     info_images: list["Info_Image"]
     schedule: list["Schedule"]
-    created_at: datetime    
+    created_at: str    
     
 class CoursesPublic(SQLModel):
     data: list[CoursePublic]
@@ -254,7 +254,7 @@ class ScheduleBase(SQLModel):
     title: str = Field(max_length=255)
     info1: str = Field(max_length=255)
     info2: str = Field(max_length=255)
-    date: str = datetime
+    date: str
     
 class ScheduleUpdate(ScheduleBase):
     pass