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dateutil.parser Gotchas: Ambiguous Dates, dayfirst, Missing Fields, Invalid Dates and relativedelta Month Ends

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Self-Hosting & Infra intermediate 5 min read $0.01 Updated 2026-10-20

Executed with python-dateutil: 10/11/12 as 2012-10-11 or 2012-11-10, Z suffix giving tzutc, 3pm parsing, default date filling, ParserError for text and for February 30, and relativedelta adding a month to January 31.

dateutil.parser.parse guesses. Learn what it returns for 10/11/12, how dayfirst changes it, which fields default silently, how invalid dates fail, and how relativedelta handles month ends.

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