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timezone "JST"
NSDateFormatter
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dateFormatter.dateFormat = @"yyyy/MM/dd";
// →
[dateFormatter dateFromString:@"1951/05/06"];
[dateFormatter dateFromString:@"1951/05/07"];
0
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2019/09/06 → 2019-09-05 15:00:00 +0000
2019-09-06 00:00:00 +0900
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1951/05/06 → 1951-05-05 15:00:00 +0000 // iOS 9
1951/05/06 → (null) // iOS 10
1951/05/07 → 1951-05-06 14:00:00 +0000
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1951/05/06 → 1951-05-05 15:00:00 +0000 // iOS 9
1951/05/06 → (null) // iOS 10
1951/05/07 → 1951-05-06 14:00:00 +0000
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6
/ 0
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1951/05/06 → 1951-05-05 15:00:00 +0000 // iOS 9
1951/05/06 → (null) // iOS 10
1951/05/07 → 1951-05-06 14:00:00 +0000
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dateFormatter.dateFormat = @"yyyy/MM/dd HH:mm:ss";
NSDate *date =
[dateFormatter dateFromString:@"1951/05/05 23:59:59"];
[date dateByAddingTimeInterval:1.f]; // `date` 1
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1951/05/05 23:59:59
1951/05/06 01:00:00
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dateFormatter.dateFormat = @"yyyy/MM/dd HH:mm:ss";
[dateFormatter dateFromString:@"1951/05/06 01:00:00"];
[dateFormatter dateFromString:@"1951/05/07 00:00:00"];
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+ 1
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// OS
1951/05/06 → 1951-05-05 15:00:00 +0000
1951/05/07 → 1951-05-06 14:00:00 +0000
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