In case of OPC, the date of AGM is considered to be the date on which the resolution is communicated by the shareholder to the Company as per the provisions of Section 122(3).
And as per 3rd proviso to Section 137(1),
a One Person Company shall file a copy of
the financial statements duly adopted by its member, along with all the
documents which are required to be attached to such financial
statements, within one hundred eighty days from the closure of the financial year......"
And if you are concerned for filings due date, please note that the late penalty will began to accumulate from the 181th day for financial statements filing in AOC-4.
Feel free to discuss for any further query.
Regards,
Pankaj Khandelwal