[bug-hunter] Timezone-aware --since filter drops valid workflow runs in fetch-workflow-logs.py

[github-actions]

Impact

Users running scripts/fetch-workflow-logs.py with a timezone-aware ISO 8601 --since value can get no runs even when matching runs exist, so downstream log triage misses failures.

Reproduction Steps

1. Create this repro script:

# /tmp/gh-aw/agent/repro_fetch_logs_since_tz.py
import json
import importlib.util
from pathlib import Path

module_path = Path('/home/runner/work/ai-github-actions/ai-github-actions/scripts/fetch-workflow-logs.py')
spec = importlib.util.spec_from_file_location('fetch_workflow_logs', module_path)
mod = importlib.util.module_from_spec(spec)
spec.loader.exec_module(mod)


def fake_github_api(path: str, token: str, accept: str = "application/vnd.github+json") -> bytes:
    if "page=1" in path:
        payload = {
            "workflow_runs": [
                {"id": 1, "created_at": "2026-02-01T09:30:00Z", "conclusion": "failure"},
                {"id": 2, "created_at": "2026-02-01T08:30:00Z", "conclusion": "failure"},
            ]
        }
    else:
        payload = {"workflow_runs": []}
    return json.dumps(payload).encode()

mod.github_api = fake_github_api
runs = mod.list_workflow_runs(
    repo="o/r",
    workflow="wf.yml",
    token="t",
    since="2026-02-01T10:00:00+01:00",  # equals 09:00:00Z
    until=None,
    conclusion="failure",
    last=10,
)

actual = [r["id"] for r in runs]
print("returned_run_ids", actual)
expected = [1]
if actual != expected:
    raise SystemExit(f"BUG: expected {expected}, got {actual}")

2. Run:

python /tmp/gh-aw/agent/repro_fetch_logs_since_tz.py

Expected vs Actual

Expected: run id=1 is included because 09:30:00Z is after 09:00:00Z (2026-02-01T10:00:00+01:00).

Actual: no runs are returned.

Actual output:

returned_run_ids []
BUG: expected [1], got []

Failing Test

import json
import importlib.util
from pathlib import Path

module_path = Path('/home/runner/work/ai-github-actions/ai-github-actions/scripts/fetch-workflow-logs.py')
spec = importlib.util.spec_from_file_location('fetch_workflow_logs', module_path)
mod = importlib.util.module_from_spec(spec)
spec.loader.exec_module(mod)


def fake_github_api(path: str, token: str, accept: str = "application/vnd.github+json") -> bytes:
    if "page=1" in path:
        payload = {
            "workflow_runs": [
                {"id": 1, "created_at": "2026-02-01T09:30:00Z", "conclusion": "failure"},
                {"id": 2, "created_at": "2026-02-01T08:30:00Z", "conclusion": "failure"},
            ]
        }
    else:
        payload = {"workflow_runs": []}
    return json.dumps(payload).encode()

mod.github_api = fake_github_api
runs = mod.list_workflow_runs(
    repo="o/r",
    workflow="wf.yml",
    token="t",
    since="2026-02-01T10:00:00+01:00",
    until=None,
    conclusion="failure",
    last=10,
)

actual = [r["id"] for r in runs]
assert actual == [1], actual

Evidence

• scripts/fetch-workflow-logs.py:69 compares timestamps as raw strings (if since and created < since:), which breaks for valid ISO 8601 formats with timezone offsets.
• Reproduction output above shows deterministic failure (expected [1], got []).

---

What is this? | From workflow: Bug Hunter

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• expires on Mar 2, 2026, 11:27 AM UTC

[github-actions]

This issue was automatically closed because it expired on 2026-03-02T11:27:16.082Z.

Closed by Workflow