The Date-ing Game

on YouTube ↗40m

" summary

Explains concrete pitfalls and fixes: when to use Calendars vs DateFormatters, why ISO8601 for APIs reduces pain, and why UTC/GMT are subtly different; shows leap‑year and emperor‑era calendar gotchas, daylight‑savings failures and the exact tests that catch them. Demos include DateComponents vs adding components, using auto‑updating calendar/timeZone, and the performance win from Swift-Foundation speedup 1.5x. Watch if you want actionable APIs, failing test cases, and exact code behaviors rather than high‑level platitudes. daylight‑savings test traps

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" chapters (12)

1. 0:00Intro
2. 1:06The Problem
3. 2:26What is a Date
4. 4:50The Gregorian Calendar
5. 7:55The Date Formatter
6. 12:11Date Components
7. 17:10Universal Time
8. 21:47Time Zones
9. 26:25Rollovers
10. 29:10Test Cases
11. 32:37Summary
12. 34:21QA

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