My man, this info (and a lot more, regarding mechanics, markets etc) is available in the white paper ^_^
Here you go - the token sale stages are divided into the following segments:

01.02.18 — 20.02.18 Zed price — $0.40
21.02.18 — 12.03.18 Zed price — $0.45
13.03.18 — 22.03.18 Zed price — $0.50
23.03.18 — 31.03.18 Zed price — $0.60
01.04.18 — 07.04.18 Zed price — $0.70
08.04.18 — 15.04.18 Zed price — $0.80

Good luck, have fun ^^