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"Timeline?..... Fix!"
- Tomoya (Birth of Lady Tomoya Dinogi)
The Gamindustri Calendar was the standard measurement of time in the Touhou galaxy. The event of Formed of Gamindustri Nation was adopted as epoch or "year zero". The time before Formed of Gamindustri Nation were called BGC is stand for Before Gamindustri Calendar and GC is stand for Gamindustri Calendar.