- 獲取到40年前的日期
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
[dateComponents setYear:-40];
self.birthDate = [gregorian dateByAddingComponents:dateComponents toDate:[NSDate date] options:0];
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