wrong service window reported in summary

[derhuerst]

Describe the bug

Aside from being inverted, with VBB's 2026-02-13 GTFS feed, the GTFS validator reports a service window of reports "2026-07-18 to 2026-02-11".

Not sure if #1807 is relevant here, but I think not, as "service window" and "majority service window" seem to be different concepts.

Steps/Code to Reproduce

Currently, VBB's link to the latest GTFS dataset will give you this feed. Once it has been updated, you can use my mirror to download the files.

curl 'https://www.vbb.de/vbbgtfs' -fsSL -I | grep -i last-modified
# last-modified: Fri, 13 Feb 2026 09:50:15 GMT
sha256sum /tmp/vbb.gtfs.zip
# 89f4acdf5c5973749076ed4876d0a846b394bd4dac758e79be9b191992e8ecd8  /tmp/vbb.gtfs.zip
unzip -v /tmp/vbb.gtfs.zip
# Archive:  /tmp/vbb.gtfs.zip
#  Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
# --------  ------  ------- ---- ---------- ----- --------  ----
#     3339  Defl:X     1053  69% 02-12-2026 18:21 8e8c336a  agency.txt
#    91912  Defl:X     7266  92% 02-12-2026 18:21 10587dd1  calendar.txt
#  1172160  Defl:X   185514  84% 02-12-2026 18:21 70f0dce3  calendar_dates.txt
#       64  Defl:X       58   9% 02-12-2026 18:21 342dcac8  frequencies.txt
#     6226  Defl:X     1724  72% 02-12-2026 18:21 89fac01d  levels.txt
#  9444300  Defl:X  1032796  89% 02-12-2026 18:21 746b79b7  pathways.txt
#    51227  Defl:X     7924  85% 02-12-2026 18:21 a6be1b4f  routes.txt
# 164073903  Defl:X 35408665  78% 02-12-2026 18:21 6479f4aa  shapes.txt
# 374846783  Defl:X 35942415  90% 02-12-2026 18:21 b1baa7ea  stop_times.txt
#  7335246  Defl:X  1196424  84% 02-12-2026 18:21 dfa05d3f  stops.txt
#  3175571  Defl:X   224088  93% 02-12-2026 18:21 f263bf41  transfers.txt
# 16717930  Defl:X  1078978  94% 02-12-2026 18:21 3f822ade  trips.txt
# --------          -------  ---                            -------
# 576918661         75086905  87%                            12 files

sha256sum vbb-gtfs.jannisr.de/2026-12-13/*.csv
# e95d6192c954d3c4f0e74fac811053a45b7a1976625852f3704ecfb90669ae54  agency.csv
# dd1e6f18dc8aef4b402a278a4b5c8b37c499df57a88d7675de5c0be2286a1115  calendar.csv
# e9dd19a02c3b859cab72052c01af8d6ee3127e0fe9079fac6ba1d540bb3f7353  calendar_dates.csv
# ec9a255440cc7a24b62b0db846920309bd3a050c2b76bbed0ba19b2f91b8e6ee  frequencies.csv
# 6bd9f4878a2b2ab233fa815d3138bbb8ac60895650d2864c834effd749765c3d  levels.csv
# 39facc5b25673a8ab765bdad366c46479224c1430cbf3b7fa7b6d7d52c5b592b  pathways.csv
# b5fb5669801021564b46a3213563ee0a6f6ea99e6c2c8c1e90f54a43fe6be5e9  routes.csv
# 0e8d62061e67564fabc0015b7627181f6598614e042ef946e2c7e5ca06550250  shapes.csv
# 559e83b88d9d4b3bec59448ebba82e4efce12de33acf4d053f4d12f094c7dc62  stop_times.csv
# 744823beb5d456b587e7081dee7a358c888088162c4e372693c817f1275f51da  stops.csv
# c583aebe6c89bbaa333b15eee09adc3fc61f2f9772a5fb7de51af91e77b19738  transfers.csv
# b536349024f2a7f99fca41d0ba13732a541b88c9cc3e62aa4502a23c9897d827  trips.csv

Expected Results

According to my gtfs-via-duckdb, the earliest service day in the dataset is 2026-02-12 and the latest is 2026-12-12.

npx --package=gtfs-via-duckdb -- -d --trips-without-shape-id -- 2026-02-13.gtfs.duckdb vbb-gtfs.jannisr.de/2026-02-13/*.csv
duckdb -readonly -csv 2026-02-13.gtfs.duckdb -c 'SELECT * FROM service_days ORDER BY date ASC LIMIT 1'
# service_id,date
# 2132,2026-02-12 00:00:00
duckdb -readonly -csv 2026-02-13.gtfs.duckdb -c 'SELECT * FROM service_days ORDER BY date DESC LIMIT 1'
# service_id,date
# 2130,2026-12-12 00:00:00

Actual Results

The GTFS validator reports a service window of reports "2026-07-18 to 2026-02-11"

Screenshots

No response

Files used

No response

Validator version

7.1.0

Operating system

macOS v15.7.3

Java version

25.0.1

Additional notes

java --version
# openjdk 25.0.1 2025-10-21
# OpenJDK Runtime Environment (build 25.0.1+8-27)
# OpenJDK 64-Bit Server VM (build 25.0.1+8-27, mixed mode, sharing)
sha256sum ~/playground/gtfs-validator-7.1.0-cli.jar
# 52c2785089aaf04e7ba1bb11b2db215692e2622eb0e196b823c194d156d9b58c  /Users/j/playground/gtfs-validator-7.1.0-cli.jar

Site note: It would be great to have a --version option:

java -jar ~/playground/gtfs-validator-7.1.0-cli.jar --version
# Exception in thread "main" com.beust.jcommander.ParameterException: Unknown option: --version
# 	at com.beust.jcommander.JCommander.parseValues(JCommander.java:742)
# 	at com.beust.jcommander.JCommander.parse(JCommander.java:282)
# 	at com.beust.jcommander.JCommander.parse(JCommander.java:265)
# 	at org.mobilitydata.gtfsvalidator.cli.Main.main(Main.java:43)

[derhuerst]

• report.html
• report.json

[davidgamez]

This should be fixed by #2029. Even though #2017 mentions "inverted," this is not the root cause. The service window is wrongly computed.