Historical basis
Phased reform timeline
The overlay switches between pyatidnevka, shestidnevka, and the restored seven-day week according to date.
Soviet Explainer
Soviet Calendar Reform Guide
This page explains the Soviet overlay as a historical work-week reform layer over Gregorian civil dating, with explicit phase changes between five-day, six-day, and restored seven-day contexts.
Overlay output for this day
Key fields
Structured details
Interpretation notes
Try this overlay on a real day
Choose a day and the page will show the full overlay output instead of only its metadata contract.
The simple rule
The Soviet system here is an overlay, not a separate civil calendar. It keeps the Gregorian date underneath and adds historically phased work-week and state-holiday logic on top of it.
Honesty rule
No fake worker assignment
The five-day phase does not pretend that a bare date can reveal one worker’s exact personal rest day assignment.