Under rule 41(1) of the GI Rules, 2002, the period for filing a notice of opposition to an application…

Rule 41(1) requires the notice within three months, or a further period not exceeding one month, "from the date when such Journal was made available to the public (which date shall be certified as such by the Registrar)". So the actual date of public availability counts. This matches section 14(1), which runs the period from advertisement, not from acceptance or filing.