Dates and Times with Their Context

What you will work through

• Separate date, local time, offset, named zone and elapsed duration.
• Preserve source timestamps while producing inspectable UTC views.
• Classify ambiguous, nonexistent and unique local times with packaged IANA rules.
• Reconcile a ninety-minute session and reject unsupported timestamp forms explicitly.

Contents

1. 01Ask what kind of time value you actually have
2. 02Preserve the original before producing a normalized value
3. 03Use offsets for instants without confusing them with zones
4. 04Resolve the hour that happens twice
5. 05Recognize the local time that never happened
6. 06Compute elapsed duration on a consistent timeline
7. 07Sort records by their meaning rather than their typography
8. 08Keep zone data and compatibility part of the evidence
9. 09Reject uncertain inputs with an actionable reason
10. 10Capstone: explain a ninety-minute session across a repeated hour

Scope and limitations

• The parser supports a declared subset rather than every RFC 3339 representation.
• Zone-dependent examples require Python 3.9+ and installed tzdata; no automatic installation occurs.
• Historical fixtures do not guarantee future time-zone rules, calendar-service behavior or precision timekeeping.