18 lines
694 B
Python
18 lines
694 B
Python
 
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from datetime import datetime, timezone
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def isoformat_utc(dt: datetime | None) -> str | None:
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"""Serialize a datetime for API responses, stamping it UTC first.
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Every DateTime column is written via app.db.models.utcnow() but SQLite/aiosqlite
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round-trips it as a naive datetime, so a bare .isoformat() drops the "Z"/offset
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and JavaScript's `new Date()` on the frontend parses the result as local time
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instead of UTC (B-35). All stored values are UTC in practice, so a naive value
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can be safely stamped rather than converted.
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"""
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if dt is None:
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return None
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if dt.tzinfo is None:
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dt = dt.replace(tzinfo=timezone.utc)
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return dt.isoformat()
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