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Make a calendar choice visible.
When a target month lacks the original day, the rule should be part of the result.
Monthstep calculates one direct whole-month offset from a valid date. You choose whether a missing target day should use that month’s last day or make the result unavailable. The result shows the requested day, target month length and any adjustment.
The calculation runs locally without an account. It uses Gregorian integers rather than your device’s timezone or a fixed number of milliseconds per day. Worked examples explain why a direct two-month shift can differ from two constrained one-month shifts.
The tool is free. Advertising may support it later, subject to actual host setup and appropriate consent. This release has no active advertising, analytics or consent-platform loaders; free access does not depend on an advertising decision.
It does not set reminders or determine which calendar rule applies to a contract, financial product or legal deadline. It supplies the stated arithmetic so you can inspect it.