NSScreencast Episode #99 Parsing and Formatting Dates

Parsing and Formatting Dates - NSScreencast

日付の変換

• Unicode Date Format Patterns UTS #35: Unicode Locale Data Markup Language
• NSDateFormatter
  • [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZ"];
  • dateFormatter dateFromString
• Not recommend - US (MM dd yyyy), UK (dd MM yyyy)
  • RubyとmとMとかだいぶ違う
  • timezone ZZZ
  • ISO8601
  • common yyyy-MM-dd'T'HH:mm:ssZ
  • NSDateFormatterNoStyle, NSDateFormatterShortStyle, NSDateFormatterMediumStyle, NSDateFormatterLongStyle
  • set locale
    • en_GB dd mm yyyy
• date from epoch
  • $ date +%s
  • $ date -r 1
• NSTimeInterval
  • timeIntervalSince1970 (seconds since epoch)