law: Negotiable Instruments Act, 1881 
  23. Calculating maturity of bill or note payable so many
  
  months after date or sight 
  In calculating the date at which a promissory note or bill of
  
  exchange, made payable at stated number of months after date or after sight, or
  
  after a certain event, is at maturity, the period stated shall be held to
  
  terminate on the day of the month, which corresponds with the day on which the
  
  instrument is dated, or presented for acceptance or sight, or noted for
  
  non-acceptance, or protested for non-acceptance, or the event happens or, where
  
  the instrument is a bill of exchange made payable at stated number of months
  
  after sight and has been accepted for honor, with the day on which it was so
  
  accepted. If the month in which the period would terminate has no corresponding
  
  day, the period shall be held to terminate on the last day of such month.
  Illustrations 
  (a) A negotiable instrument dated 29th January, 1878, is made
  
  payable at one month after date. The instrument is at maturity on the third day
  
  after the 28th February, 1878.
  (b) A negotiable instrument, dated 30th August, 1878, is made
  
  payable three months after date. The instrument is at maturity on the 3rd
  
  December, 1878.
  (c) A promissory note or bill of exchange, dated 31st August,
  
  1878, is made payable three months after date. The instrument is at maturity on
  
  the 3rd December, 1878.