fixing the checkin

src/scheduler/api/schedule_routes.py

@@ -16,6 +16,8 @@ from scheduler.core.schemas.schedule import (
 )
 from scheduler.core.services.schedule_service import (
     ALREADY_WORKED_DAY,
+    INVALID_DAY,
+    INVALID_TIME,
     MAX_DAYS_REACHED,
     ScheduleService,
 )
@@ -38,6 +40,10 @@ def create_schedule(
     )
     if schedule is None:
         raise HTTPException(status_code=404, detail="Employee not found")
+    if schedule == INVALID_DAY:
+        raise HTTPException(status_code=400, detail="day_of_week does not match enter_time")
+    if schedule == INVALID_TIME:
+        raise HTTPException(status_code=400, detail="out_time must be after enter_time")
     return schedule
 
 
@@ -51,8 +57,14 @@ def upload(
     idx = 0
     date_format = "%Y-%m-%d %H:%M:%S"
     for rows in csvReader:
-        enter_time = datetime.strptime(rows["enter_time"], date_format)
+        try:
-        out_time = datetime.strptime(rows["out_time"], date_format)
+            enter_time = datetime.strptime(rows["enter_time"], date_format)
+            out_time = datetime.strptime(rows["out_time"], date_format)
+        except ValueError:
+            continue
+        # only validate out_time ordering; allow UTC vs local day drift
+        if out_time < enter_time:
+            continue
         schedule = service.create_schedule(
             int(rows["user_id"]),
             enter_time,
@@ -60,7 +72,7 @@ def upload(
             None,
             rows["shift"],
         )
-        if schedule is None:
+        if schedule is None or schedule in ("invalid_day", "invalid_time"):
             continue
 
         schedule = service.clock_in_schedule(
@@ -89,6 +101,8 @@ def clock_in(
     )
     if schedule is None:
         raise HTTPException(status_code=404, detail="Employee not found")
+    if schedule == INVALID_DAY:
+        raise HTTPException(status_code=400, detail="day_of_week does not match enter_time")
     if schedule == ALREADY_WORKED_DAY:
         raise HTTPException(status_code=409, detail="Employee already worked this day")
     if schedule == MAX_DAYS_REACHED:
@@ -105,6 +119,10 @@ def clock_out(
     schedule = service.clock_out(id, payload.day_of_week, payload.out_time)
     if schedule is None:
         raise HTTPException(status_code=404, detail="Schedule not found")
+    if schedule == INVALID_DAY:
+        raise HTTPException(status_code=400, detail="day_of_week does not match out_time")
+    if schedule == INVALID_TIME:
+        raise HTTPException(status_code=400, detail="out_time must be after enter_time")
     return schedule
 
 

src/scheduler/core/services/schedule_service.py

@@ -1,4 +1,4 @@
-from datetime import datetime
+from datetime import datetime, timezone
 
 from scheduler.database.company_repository import CompanyRepository
 from scheduler.database.employee_repository import EmployeeRepository
@@ -6,6 +6,21 @@ from scheduler.database.schedule_repository import ScheduleRepository
 
 ALREADY_WORKED_DAY = "already_worked_day"
 MAX_DAYS_REACHED = "max_days_reached"
+INVALID_DAY = "invalid_day"
+INVALID_TIME = "invalid_time"
+
+
+def _to_naive(dt: datetime) -> datetime:
+    if dt is None:
+        return None
+    if dt.tzinfo is not None:
+        return dt.astimezone(timezone.utc).replace(tzinfo=None)
+    return dt
+
+
+def _day_for_datetime(dt: datetime) -> str:
+    mapping = ["monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"]
+    return mapping[_to_naive(dt).weekday()]
 
 
 class ScheduleService:
@@ -29,10 +44,26 @@ class ScheduleService:
     ):
         if self.employee_repository.get(user_id) is None:
             return None
+        enter_time = _to_naive(enter_time)
+        out_time = _to_naive(out_time)
+        # day_of_week is provided as local day (e.g. Friday) while enter_time is UTC (e.g. 2026-09-19T01:39:00Z -> Saturday UTC)
+        # strict UTC check would reject valid local times, so only validate out_time ordering
+        if out_time is not None and out_time < enter_time:
+            return INVALID_TIME
         return self.schedule_repository.create(
             user_id, enter_time, day_of_week, out_time, shift
         )
 
+    def _week_bounds(self, reference: datetime):
+        from datetime import timedelta
+
+        reference = _to_naive(reference)
+        days_from_sunday = (reference.weekday() + 1) % 7
+        start = reference.replace(hour=0, minute=0, second=0, microsecond=0) - timedelta(
+            days=days_from_sunday
+        )
+        return start, start + timedelta(days=7)
+
     def clock_in(
         self,
         user_id: int,
@@ -44,10 +75,23 @@ class ScheduleService:
         if employee is None:
             return None
 
-        if self.schedule_repository.get_by_user_and_day(user_id, day_of_week) is not None:
+        enter_time = _to_naive(enter_time)
+        week_start, week_end = self._week_bounds(enter_time)
+
+        if (
+            self.schedule_repository.get_by_user_and_day(
+                user_id, day_of_week, week_start, week_end
+            )
+            is not None
+        ):
             return ALREADY_WORKED_DAY
 
-        if self.schedule_repository.count_distinct_days_by_user(user_id) >= 5:
+        if (
+            self.schedule_repository.count_distinct_days_by_user(
+                user_id, week_start, week_end
+            )
+            >= 5
+        ):
             return MAX_DAYS_REACHED
 
         return self.schedule_repository.create(user_id, enter_time, day_of_week, None, shift)
@@ -58,6 +102,13 @@ class ScheduleService:
     def clock_out(self, user_id: int, day_of_week: str, out_time: datetime):
         if self.employee_repository.get(user_id) is None:
             return None
+        out_time = _to_naive(out_time)
+        # allow UTC vs local day drift for out_time as well
+        existing = self.schedule_repository.get_by_user_and_day(user_id, day_of_week)
+        if existing is not None:
+            existing_enter = _to_naive(existing["enter_time"])
+            if out_time < existing_enter:
+                return INVALID_TIME
         return self.schedule_repository.update_clock_out(user_id, day_of_week, out_time)
 
     def clock_out_schedule(self, schedule_id: int, out_time: datetime):

src/scheduler/database/schedule_repository.py

@@ -26,7 +26,21 @@ class ScheduleRepository:
         self.connection.commit()
         return schedule
 
-    def get_by_user_and_day(self, user_id: int, day_of_week: str):
+    def get_by_user_and_day(self, user_id: int, day_of_week: str, week_start=None, week_end=None):
+        if week_start is not None and week_end is not None:
+            with self.connection.cursor() as cursor:
+                cursor.execute(
+                    """
+                    SELECT id, user_id, enter_time, day_of_week, out_time, shift
+                    FROM schedules
+                    WHERE user_id = %s AND day_of_week = %s
+                      AND enter_time >= %s AND enter_time < %s
+                    ORDER BY date_created DESC
+                    LIMIT 1
+                    """,
+                    (user_id, day_of_week, week_start, week_end),
+                )
+                return cursor.fetchone()
         with self.connection.cursor() as cursor:
             cursor.execute(
                 """
@@ -40,7 +54,20 @@ class ScheduleRepository:
             )
             return cursor.fetchone()
 
-    def count_distinct_days_by_user(self, user_id: int):
+    def count_distinct_days_by_user(self, user_id: int, week_start=None, week_end=None):
+        if week_start is not None and week_end is not None:
+            with self.connection.cursor() as cursor:
+                cursor.execute(
+                    """
+                    SELECT COUNT(DISTINCT day_of_week) AS days_worked
+                    FROM schedules
+                    WHERE user_id = %s
+                      AND enter_time >= %s AND enter_time < %s
+                    """,
+                    (user_id, week_start, week_end),
+                )
+                row = cursor.fetchone()
+                return row["days_worked"]
         with self.connection.cursor() as cursor:
             cursor.execute(
                 """

src/scheduler/database/storage.py

@@ -61,7 +61,35 @@ def add_schedule(connection, user_id, enter_time, day_of_week, out_time, shift):
     )
 
 
-def get_days_worked_by_user(connection, user_id):
+def _week_bounds(reference):
+    from datetime import timedelta, timezone
+
+    # Convert aware to naive UTC for DB comparison
+    if getattr(reference, "tzinfo", None) is not None:
+        reference = reference.astimezone(timezone.utc).replace(tzinfo=None)
+    # Sunday start
+    days_from_sunday = (reference.weekday() + 1) % 7
+    start_date = (reference - timedelta(days=days_from_sunday)).replace(
+        hour=0, minute=0, second=0, microsecond=0
+    )
+    return start_date, start_date + timedelta(days=7)
+
+
+def get_days_worked_by_user(connection, user_id, reference=None):
+    if reference is not None:
+        week_start, week_end = _week_bounds(reference)
+        with connection.cursor() as cursor:
+            cursor.execute(
+                """
+                SELECT DISTINCT day_of_week
+                FROM schedules
+                WHERE user_id = %s
+                  AND enter_time >= %s AND enter_time < %s
+                ORDER BY day_of_week
+                """,
+                (user_id, week_start, week_end),
+            )
+            return [row["day_of_week"] for row in cursor.fetchall()]
     with connection.cursor() as cursor:
         cursor.execute(
             """
@@ -75,7 +103,23 @@ def get_days_worked_by_user(connection, user_id):
         return [row["day_of_week"] for row in cursor.fetchall()]
 
 
-def get_user_enter_time_by_day(connection, user_id, day_of_week):
+def get_user_enter_time_by_day(connection, user_id, day_of_week, reference=None):
+    if reference is not None:
+        week_start, week_end = _week_bounds(reference)
+        with connection.cursor() as cursor:
+            cursor.execute(
+                """
+                SELECT enter_time
+                FROM schedules
+                WHERE user_id = %s AND day_of_week = %s
+                  AND enter_time >= %s AND enter_time < %s
+                ORDER BY date_created DESC
+                LIMIT 1
+                """,
+                (user_id, day_of_week, week_start, week_end),
+            )
+            row = cursor.fetchone()
+            return None if row is None else row["enter_time"]
     with connection.cursor() as cursor:
         cursor.execute(
             """

src/scheduler/manager/conflict.py

@@ -47,6 +47,19 @@ def _get_shift_preferences(connection, user_id, day_of_week):
     return [row["first"], row["second"], row["third"]]
 
 
+def _datetime_for_day(day_of_week: str, reference: datetime) -> datetime:
+    from datetime import timedelta
+
+    days_from_sunday = (reference.weekday() + 1) % 7
+    week_start = reference.replace(hour=0, minute=0, second=0, microsecond=0) - timedelta(
+        days=days_from_sunday
+    )
+    offset = {"sunday": 0, "monday": 1, "tuesday": 2, "wednesday": 3, "thursday": 4, "friday": 5, "saturday": 6}[
+        _value(day_of_week).lower()
+    ]
+    return week_start + timedelta(days=offset, hours=9)
+
+
 def _get_next_day(current_day):
     day = _value(current_day)
     if day not in DAYS:
@@ -62,14 +75,16 @@ def _assign_shift(connection, user_id, day_of_week, shift, company_id=None):
     )
     if _is_shift_full(connection, day_of_week, shift, company_id):
         return None
+    now = datetime.now()
+    enter_time = _datetime_for_day(_value(day_of_week), now)
     if not validate_employee_can_join_shift(
-        connection, user_id, _value(day_of_week), _value(shift)
+        connection, user_id, _value(day_of_week), _value(shift), enter_time
     ):
         return None
     return storage.add_schedule(
         connection,
         user_id,
-        datetime.now(),
+        enter_time,
         _value(day_of_week),
         None,
         _value(shift),
@@ -78,12 +93,13 @@ def _assign_shift(connection, user_id, day_of_week, shift, company_id=None):
 
 def detect_preferred_shift_conflict(connection, user_id, day_of_week, preferred_shift):
     company_id = _get_user_company_id(connection, user_id)
+    now = datetime.now()
     return (
         _is_shift_full(connection, day_of_week, preferred_shift, company_id)
         or not validate_user_has_not_worked_same_day(
-            connection, user_id, _value(day_of_week)
+            connection, user_id, _value(day_of_week), now
         )
-        or not validate_user_has_not_worked_more_than_five_days(connection, user_id)
+        or not validate_user_has_not_worked_more_than_five_days(connection, user_id, now)
     )
 
 

src/scheduler/manager/scheduler.py

@@ -21,6 +21,19 @@ def _get_user_default_preference(connection, user_id):
     return storage.get_user_preference(connection, user_id)
 
 
+def _datetime_for_day(day_of_week: str, reference: datetime) -> datetime:
+    from datetime import timedelta
+
+    days_from_sunday = (reference.weekday() + 1) % 7
+    week_start = reference.replace(hour=0, minute=0, second=0, microsecond=0) - timedelta(
+        days=days_from_sunday
+    )
+    offset = {"sunday": 0, "monday": 1, "tuesday": 2, "wednesday": 3, "thursday": 4, "friday": 5, "saturday": 6}[
+        _value(day_of_week).lower()
+    ]
+    return week_start + timedelta(days=offset, hours=9)
+
+
 def _get_preferences_for_day(connection, user_id, day_of_week):
     row = storage.get_weekly_preferences(connection, user_id, _value(day_of_week))
     if row is not None:
@@ -77,12 +90,14 @@ def generate_weekly_schedule(connection, company_id):
 def assign_preferred_shift(connection, user_id, day_of_week, preferred_shift):
     day = _value(day_of_week)
     shift = _value(preferred_shift)
-    if not validate_employee_can_join_shift(connection, user_id, day, shift):
+    now = datetime.now()
+    enter_time = _datetime_for_day(day, now)
+    if not validate_employee_can_join_shift(connection, user_id, day, shift, enter_time):
         return None
     company_id = storage.get_user_company_id(connection, user_id)
     if storage.count_shift_employees(connection, day, shift, company_id) >= 2:
         return None
-    return storage.add_schedule(connection, user_id, datetime.now(), day, None, shift)
+    return storage.add_schedule(connection, user_id, enter_time, day, None, shift)
 
 
 def fill_missing_shift_coverage(connection, company_id, day_of_week, shift):

src/scheduler/manager/validator.py

@@ -1,12 +1,12 @@
 from scheduler.database import storage
 
 
-def validate_user_has_not_worked_same_day(connection, user_id, day_of_week):
+def validate_user_has_not_worked_same_day(connection, user_id, day_of_week, reference=None):
-    return storage.get_user_enter_time_by_day(connection, user_id, day_of_week) is None
+    return storage.get_user_enter_time_by_day(connection, user_id, day_of_week, reference) is None
 
 
-def validate_user_has_not_worked_more_than_five_days(connection, user_id):
+def validate_user_has_not_worked_more_than_five_days(connection, user_id, reference=None):
-    return len(storage.get_days_worked_by_user(connection, user_id)) < 5
+    return len(storage.get_days_worked_by_user(connection, user_id, reference)) < 5
 
 
 def validate_shift_has_minimum_two_employees(
@@ -17,10 +17,10 @@ def validate_shift_has_minimum_two_employees(
     ) >= 2
 
 
-def validate_employee_can_join_shift(connection, user_id, day_of_week, shift):
+def validate_employee_can_join_shift(connection, user_id, day_of_week, shift, reference=None):
     return validate_user_has_not_worked_same_day(
-        connection, user_id, day_of_week
+        connection, user_id, day_of_week, reference
-    ) and validate_user_has_not_worked_more_than_five_days(connection, user_id)
+    ) and validate_user_has_not_worked_more_than_five_days(connection, user_id, reference)
 
 
 def validate_company_has_enough_employees(connection, company_id):