Hot-fix handle timezone issues with OH recurrence pattern

backend/models/office_hours/office_hours_recurrence_pattern.py

@@ -1,6 +1,6 @@
 from datetime import datetime
-
-from pydantic import BaseModel
+from zoneinfo import ZoneInfo
+from pydantic import BaseModel, field_validator, ValidationInfo
 
 __authors__ = ["Jade Keegan"]
 __copyright__ = "Copyright 2024"
@@ -26,6 +26,23 @@ class NewOfficeHoursRecurrencePattern(BaseModel):
     recur_saturday: bool
     recur_sunday: bool
 
+    @field_validator("start_date", "end_date", mode="before")
+    @classmethod
+    def remove_timezone(cls, value: datetime):
+        if type(value) == str:
+            dt = datetime.fromisoformat(value.replace("Z", "+00:00"))
+            dt = dt.astimezone(ZoneInfo("America/New_York"))
+            dt = dt.replace(tzinfo=None)
+            return dt
+        return value
+
+    @field_validator("end_date")
+    @classmethod
+    def check_end_greater_than_start(cls, v: datetime, info: ValidationInfo):
+        if v <= info.data["start_date"]:
+            raise ValueError("end must be greater than start")
+        return v
+
 
 class OfficeHoursRecurrencePattern(NewOfficeHoursRecurrencePattern):
     """