Date and Time in Swift - Date Handling in Swift Programming
summary
Covers concrete Swift APIs and gotchas: how Date stores a monotonic seconds count, why Apple uses a 2001 reference (difference 978307200 seconds from 1970), and how 32‑bit Unix time overflows push choices. Shows practical use of Calendar, DateComponents and formatters, explains why date(byAdding:) (adds intervals) differs from building dates with date(from:) (matches closest valid components), and describes building a robust month display using only year/month/day and tests for DST and leap‑year edge cases.
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chapters (16)
- 0:00Introduction and humor
- 1:03Why date handling is tricky
- 2:30How computers represent dates
- 6:26Human vs computer time
- 7:08The Gregorian calendar history
- 11:02Working with calendars in Swift
- 11:45Date formatting basics
- 14:14Advanced date formatters
- 15:16Swift format styles
- 17:44Date components explained
- 23:01Understanding time zones
- 29:01Time zone complexities
- 31:52Practical date advice
- 33:16Testing date handling
- 35:01Daylight saving time pitfalls
- 41:00Summary and key takeaways
