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private async void OnTimeInClicked(object sender, EventArgs e)
{
    try
    {
        var hasEntryForToday = await _firebaseHelper.HasTimeEntryForTodayAsync(
            _currentInstructors.ID, 
            SubjectCodeLabel.Text
        );

        if (hasEntryForToday)
        {
            await DisplayAlert("Error", "You already have a time entry for this subject today.", "OK");
            return;
        }

        var timeEntry = new TimeEntry
        {
            instructorId = _currentInstructors.ID,
            FirstName = _currentInstructors.FirstName,
            LastName = _currentInstructors.LastName,
            TimeIn = DateTime.Now,
            SubjectName = SubjectNameLabel.Text,
            SubjectCode = SubjectCodeLabel.Text
        };

        _currentEntryKey = await _firebaseHelper.AddTimeInAsync(timeEntry);

        if (!string.IsNullOrEmpty(_currentEntryKey))
        {
            TimeInLabel.Text = timeEntry.TimeIn.ToString("g");
            TimeOutButton.IsEnabled = true;
            TimeInButton.IsEnabled = false;
        }
        else
        {
            await DisplayAlert("Error", "Failed to record Time In.", "OK");
        }
    }
    catch (Exception ex)
    {
        await DisplayAlert("Error", $"An error occurred: {ex.Message}", "OK");
    }
}