The case of 'All Souls' is explicitly dated to April 1998. Episode: Season 5, Episode 17 (5X17). Canon in-story month from X-Files Wiki.
Date Calculation
Trace the formula back to its fixed date.
c. April 26, 1998
Scully investigates the angelic deaths of All Souls in April 1998Formula
c. March 8, 1998
Alex Krycek barely survives the rebel alien purgeFormula
c. November 9, 1997
The Cigarette Smoking Man survives being shot during the conspiracy crisisFormula
c. April 12, 1997
Mulder's traumatic memory spiral culminates in the events of DemonsEvent Context
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April 12, 2026 at 07:54 AM
May 16, 2026 at 08:33 PM
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