diff --git a/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/config_migrations.py b/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/config_migrations.py
index 7af98ed13c4f0..c7560659d8ad9 100644
--- a/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/config_migrations.py
+++ b/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/config_migrations.py
@@ -3,6 +3,7 @@
 #
 import logging
 from typing import Any, List, Mapping
+
 from airbyte_cdk.config_observation import create_connector_config_control_message
 from airbyte_cdk.entrypoint import AirbyteEntrypoint
 from airbyte_cdk.sources import Source
@@ -30,10 +31,10 @@ def should_migrate(cls, config: Mapping[str, Any]) -> bool:
         """
         return "project_id" in config
 
-    @classmethod
-    def move_project_id(cls, config: Mapping[str, Any], source: Source = None) -> Mapping[str, Any]:
+    @staticmethod
+    def move_project_id(config: Mapping[str, Any]) -> Mapping[str, Any]:
         # assign old values to new property that will be used within the new version
-        if isinstance(config.get("credentials")):
+        if isinstance(config.get("credentials", 0), dict):
             config["credentials"]["project_id"] = config["project_id"]
         else:
             config["credentials"] = {"project_id": config["project_id"]}
@@ -43,7 +44,7 @@ def move_project_id(cls, config: Mapping[str, Any], source: Source = None) -> Ma
     @classmethod
     def modify_and_save(cls, config_path: str, source: Source, config: Mapping[str, Any]) -> Mapping[str, Any]:
         # modify the config
-        migrated_config = cls.move_project_id(config, source)
+        migrated_config = cls.move_project_id(config)
         # save the config
         source.write_config(migrated_config, config_path)
         # return modified config
diff --git a/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/spec.json b/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/spec.json
index ca6546f1d94ff..39bd5024268e5 100644
--- a/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/spec.json
+++ b/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/spec.json
@@ -36,7 +36,7 @@
                 "airbyte_secret": true
               },
               "project_id": {
-                "order": 1,
+                "order": 3,
                 "title": "Project ID",
                 "description": "Your project ID number. See the <a href=\"https://help.mixpanel.com/hc/en-us/articles/115004490503-Project-Settings#project-id\">docs</a> for more information on how to obtain this. Required if you are using a service account to authenticate.",
                 "type": "integer"
diff --git a/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/streams/base.py b/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/streams/base.py
index 49a19b987e151..17ac3c3e0b14a 100644
--- a/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/streams/base.py
+++ b/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/streams/base.py
@@ -12,6 +12,7 @@
 from airbyte_cdk.sources.streams.http import HttpStream
 from airbyte_cdk.sources.streams.http.auth import HttpAuthenticator
 from pendulum import Date
+from source_mixpanel.utils import fix_date_time
 
 
 class MixpanelStream(HttpStream, ABC):
@@ -90,6 +91,7 @@ def process_response(self, response: requests.Response, **kwargs) -> Iterable[Ma
             data = [json_response]
 
         for record in data:
+            fix_date_time(record)
             yield record
 
     def parse_response(
diff --git a/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/utils.py b/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/utils.py
index cea753dbee29d..cc1d1402647d8 100644
--- a/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/utils.py
+++ b/airbyte-integrations/connectors/source-mixpanel/source_mixpanel/utils.py
@@ -2,6 +2,7 @@
 # Copyright (c) 2023 Airbyte, Inc., all rights reserved.
 #
 
+import re
 
 from airbyte_cdk.models import SyncMode
 from airbyte_cdk.sources.streams import Stream
@@ -13,3 +14,50 @@ def read_full_refresh(stream_instance: Stream):
         records = stream_instance.read_records(stream_slice=_slice, sync_mode=SyncMode.full_refresh)
         for record in records:
             yield record
+
+
+# Precompile the regex pattern.
+ISO_FORMAT_PATTERN = re.compile(r"^(\d{4}-\d{2}-\d{2})[ t](\d{2}:\d{2}:\d{2})$")
+
+
+def to_iso_format(s: str) -> str:
+    """
+    Convert a date string to ISO format if it matches recognized patterns.
+
+    Args:
+    - s (str): Input string to be converted.
+
+    Returns:
+    - str: Converted string in ISO format or the original string if no recognized pattern is found.
+    """
+    # Use the precompiled regex pattern to match the date format.
+    match = ISO_FORMAT_PATTERN.match(s)
+    if match:
+        return match.group(1) + "T" + match.group(2)
+
+    return s
+
+
+def fix_date_time(record):
+    """
+    Recursively process a data structure to fix date and time formats.
+
+    Args:
+    - record (dict or list): The input data structure, which can be a dictionary or a list.
+
+    Returns:
+    - None: The function modifies the input data structure in place.
+    """
+    # Define the list of fields that might contain date and time values.
+    date_time_fields = {"last_seen", "created", "last_authenticated"}
+
+    if isinstance(record, dict):
+        for field, value in list(record.items()):  # Convert to list to avoid runtime errors during iteration.
+            if field in date_time_fields and isinstance(value, str):
+                record[field] = to_iso_format(value)
+            elif isinstance(value, (dict, list)):
+                fix_date_time(value)
+
+    elif isinstance(record, list):
+        for entry in record:
+            fix_date_time(entry)