We are still in the first 24 hours of phase 1, I think, but currently the calculator converts new contributions as 1000 AE for 1 ETH. Also, the wallet shows the text "get 1000 AE for 1 ETH till 1d 18h 30m". How is this possible?

If phase one started at 13h05m UTC on April 3, then "the first 24 hours" should last until 13h05 UTC on April 4, I think.

If you meant that the bonus would end on 23h59m59s on April 3, you should have written "the first UTC day of phase 1", not "the first 24 hours of phase 1".