Warranty applies from date of purchase or date of delivery?

1)Normally Warranty tenure is from date of bill . The underlying assumption  is sales are complete when buyer has taken the goods out of the Showroom.

2) if the terms of sale were " delivered and installed " then property in goods may be said to pass after such acts and the Sale is complete only  then,. The conduct of the parties and the agreements have to be seen. See S. 19 to S. 21 of Sales of Goods Act.

3) Explicit terms override implied ones. If it is explicitly stated in the Contract that   Warranty is 12 months from date of invoice then that will hold.

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