# Timezone Fix Summary

## Issue
The clock-in time was showing 13:05 when the actual time in Riyadh was 16:05 (3-hour difference). This was because the system was using UTC time instead of properly converting to Asia/Riyadh timezone.

## Root Cause
1. Django was correctly configured with `TIME_ZONE = "Asia/Riyadh"` and `USE_TZ = True`
2. However, some code was using `datetime.now()` instead of Django's timezone-aware `timezone.now()`
3. The attendance clock-in/out was using `timezone.now().time()` which extracts the UTC time component instead of the local time

## Changes Made

### 1. Fixed `finance/models.py`
**Lines affected:** 4 methods in the CSID model
- Changed `from datetime import datetime` to `from django.utils import timezone`
- Replaced `datetime.now()` with `timezone.now()` in:
  - `is_valid` property
  - `days_until_expiry` property
  - `revoke()` method
  - `increment_usage()` method

### 2. Fixed `finance/zatca_service.py`
**Lines affected:** Import statement
- Removed unused `from datetime import datetime, timezone` import
- Kept `from django.utils import timezone as django_timezone` which is the correct one to use

### 3. Fixed `finance/csid_manager.py`
**Lines affected:** Import and get_active_csid method
- Changed `from datetime import datetime, timedelta` to `from datetime import timedelta`
- Added `from django.utils import timezone`
- Replaced `datetime.now()` with `timezone.now()` in the `get_active_csid()` method

### 4. Fixed `hr/views.py` (CRITICAL FIX)
**Lines affected:** AttendanceKioskView.post() method
- Changed `now = timezone.now().time()` to `now = timezone.localtime(timezone.now()).time()`
- This ensures the time is converted to Riyadh timezone before extracting the time component

## How It Works Now

1. **Django Settings**: 
   - `TIME_ZONE = "Asia/Riyadh"` - Sets the default timezone
   - `USE_TZ = True` - Enables timezone-aware datetimes
   - `CELERY_TIMEZONE = "Asia/Riyadh"` - Ensures Celery tasks use correct timezone

2. **Time Storage**:
   - Django stores all datetimes in UTC internally (in the database)
   - When displaying, Django automatically converts to the configured timezone

3. **Clock In/Out**:
   - `timezone.now()` returns current time in UTC
   - `timezone.localtime(timezone.now())` converts it to Riyadh time
   - `.time()` extracts just the time component (now in Riyadh timezone)

## Testing

A test script was created (`test_timezone.py`) to verify the configuration:
```bash
python3 test_timezone.py
```

Expected output:
- TIME_ZONE: Asia/Riyadh
- USE_TZ: True
- CELERY_TIMEZONE: Asia/Riyadh
- Current timezone offset: +0300 (UTC+3)

## Additional Tools Created

### 1. `test_timezone.py`
A diagnostic script to verify timezone configuration and test datetime handling.

### 2. `core/management/commands/fix_timezone_data.py`
A management command to convert any existing naive datetime fields to timezone-aware datetimes.
Usage:
```bash
python3 manage.py fix_timezone_data --dry-run  # Preview changes
python3 manage.py fix_timezone_data            # Apply changes
```

## Verification

To verify the fix is working:
1. Try clocking in now - the time should show the correct Riyadh time (16:05 instead of 13:05)
2. Check any new attendance records - they should display the correct local time
3. All datetime operations throughout the system now use timezone-aware datetimes

## Best Practices Going Forward

1. **Always use** `timezone.now()` instead of `datetime.now()`
2. **For local time**, use `timezone.localtime(timezone.now())`
3. **For time-only fields**, use `timezone.localtime(timezone.now()).time()`
4. **Never import** `from datetime import timezone` - use Django's `from django.utils import timezone`
5. **All DateTimeField** models automatically handle timezone conversion when `USE_TZ = True`

## Files Modified

1. `finance/models.py` - Fixed 4 datetime.now() usages
2. `finance/zatca_service.py` - Removed problematic import
3. `finance/csid_manager.py` - Fixed datetime.now() usage
4. `hr/views.py` - Fixed clock-in/out to use local time
5. `test_timezone.py` - Created (new file)
6. `core/management/commands/fix_timezone_data.py` - Created (new file)
7. `TIMEZONE_FIX_SUMMARY.md` - Created (this file)

## Status
✅ All timezone issues have been fixed
✅ Clock-in/out now uses correct Riyadh time
✅ All datetime operations are timezone-aware
✅ System is configured correctly for Asia/Riyadh timezone