Landing: 2451667193e4
Project / Subsystem
gcc / libstdc++
Date
2026-05-13
Author
Tomasz Kamiński
Commit
2451667193e4e00b49c4ef9d95c0a3a1aa955f82
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- libstdc++
- patch_id
- —
- commit_hash
- 2451667193e4e00b49c4ef9d95c0a3a1aa955f82
- source_type
- github
- headline
- libstdc++: Use on_month_day istream operator in ZoneInfo parsing.
- tldr
- libstdc++'s ZoneInfo parsing now uses the `on_month_day` istream operator for more flexible date parsing.
- author
- Tomasz Kamiński
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • libstdc++
- • time zones
- • parsing
- • c++20
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-13T00:00:00.000Z
This commit modifies ZoneInfo parsing in libstdc++ to directly use the operator>> for on_month_day, removing the on_day tag. The operator>>(istream&, on_month_day) is updated to handle cases where the month component is missing and to set failbit accordingly. This change enables parsing month, day, and time in a single operation. The code also handles failures when parsing the day number N for Www>=N or Www<=N productions, leaving the day part of the input unchanged and setting failbit.