In the web anyone can see the 4 phases of the ICO, in which a discount is offered:

26th November: 30% off (2 weeks)

10th December: 24% off (2 weeks)

24th December: 16% off (2 weeks)

7th January (2019): 10% off (2 weeks).

But after 21st January there are still 5 days to buy INX without any discount, before starting in the Exchanges.

In the White Paper everyone can see this “Final Phase” starts on 22nd January and finish on 26th January. That is the official final date.

More details: https://innovaminex.com/docs/whitepaper-en.pdf