Section 19
Instruments payable on demand
Chapter 2: Of notes, bills and cheques
A promissory note or bill of exchange, in which no time for payment is specified, and a cheque, are payable on demand.
The Negotiable Instruments Act, 1881 (Act No. 26 of 1881). From the updated text on India Code, with later amendments. Being checked against the official copy; amendment notes are not shown yet.