Maximum complaint time since occurrence or discovery

Presidential  Elections Act, No.15 of 1981

102. (1). Every electionpetition shall be presented within twenty one days of the date of publicationof the result of the election in the Gazette:

Provided that an electionpetition questioning the return of the election upon the ground of a corruptpractice and specifically alleging a payment of money or other act to have beenmade or done since the date aforesaid by the person whose election isquestioned or by an agent of such person or with the privity of such or hisauthorized agent in pursuance or in furtherance of such corrupt practice may,so far as respects such corrupt practice, be presented at any time within twentyeight days after the date of such payment or act.

(2). An election petitionpresented in due time may, for the purpose of questioning the return or theelection upon an allegation of a corrupt or illegal practice, be amended withthe leave of a Judge of the Supreme Court within the time within which anelection petition questioning the return or the election upon that ground maybe presented.

Source:

http://aceproject.org/regions-en/countries-and-territories/LK/case-studies/presidential-elections-act-no-15-of-1981.pdf/view