GTFS Express Open GTFS Express

prior_notice_last_day_after_start_day: GTFS validation rule (booking_rules.txt) Error

prior_notice_last_day is strictly greater than prior_notice_start_day on a booking_rules.txt row.

Updated on 23 October 2026

What the rule checks

prior_notice_last_day is strictly greater than prior_notice_start_day on a booking_rules.txt row.

Severity: error

An error marks data that breaks the GTFS specification. A journey planner or a rider app may refuse the file, or show a wrong version of it. Correct it before publishing the GTFS.

Where it applies

The rule applies to booking_rules.txt.

Finding and correcting it

Open the GTFS in GTFS Express. Reading is free, and the validation, by the MobilityData validator and the rules of GTFS Express itself, lists the occurrences of prior_notice_last_day_after_start_day with the file and rows involved. The correction is made in a draft, by hand or from a brief, with the licence: the corrected GTFS is validated again before it is delivered, and the change can be undone.

In the MobilityData validator

The MobilityData GTFS validator uses the same code, prior_notice_last_day_after_start_day. Its documentation describes each rule: MobilityData validator rules.

Rules of the same domain