Yes, the Commissioner of State Tax (Tamil Nadu Goods and Service Tax) has indeed extended the deadline for filing the return in Form 5A for the months of July, August, and September 2017. This extension provides taxpayers with additional time to ensure compliance with the GST regulations. To take advantage of this extension, taxpayers in Delhi, India, should promptly submit their Form 5A returns for the specified months. It is crucial to adhere to the revised deadline to avoid any penalties or non-compliance issues. Taxpayers are advised to review their records, accurately complete the Form 5A, and submit it within the extended timeline. For further details or clarifications, individuals can refer to the official notification or reach out to the relevant tax authorities for guidance and support.