Myself Thriveni, I have gone through your requirement and I can able to complete with in a day.
Please reach out to me if you are interested.
With my extensive background in Excel VBA and deep understanding of Google Sheets, I am ideally positioned to fulfill your project requirements. Over the past 6 years, I have been effectively leveraging Microsoft Excel for data analysis enabling me to not only familiarize myself with complex spreadsheets but also identify sensible automation solutions. Transforming the Google Sheet to restrict access for unsuspecting students and granting them permission to mark their attendance only on the 'Current Date' has been a tried and tested task for me.
I understand the time sensitivity of this project and assure you that I can complete it well within the stipulated 5-6 hours timeframe. My considerable experience streamlining processes through automation means that my solution will not necessitate frequent manual updates, resulting in higher efficiency and better time management for all stakeholders involved.
In summary, as an experienced professional equipped with skills specifically tailored to your needs, I can provide you with the secure functionality, efficient data management, and high-quality deliverables you seek. Let's discuss further about your precise requirements and get started on this project without delay!