Helix: Descent N Ascent will be available today at:
9 AM Pacific Time
12 PM Eastern Time
5 PM GMT
6 PM Central European Time
01 AM China, Beijing (next day)
02 AM Japan (next day)
04 AM Australia, Sydney (next day)

Developer announcements, patch notes and gaming coverage from across the GaugeDB catalogue.
Source: Steam Community (opens in a new tab)
Helix: Descent N Ascent will be available today at:
9 AM Pacific Time
12 PM Eastern Time
5 PM GMT
6 PM Central European Time
01 AM China, Beijing (next day)
02 AM Japan (next day)
04 AM Australia, Sydney (next day)

Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.