用NSDateFormatter轉(zhuǎn)化日期

先來看OC

//初始化formatter對象
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
//指定時區(qū)，東八區(qū)
[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"]];
//類型轉(zhuǎn)換格式
[formatter setDateFormat:@"yyyy-MM-dd"];
//字符串轉(zhuǎn)Date
NSDate *date = [formatter dateFromString:dateStr];
//Date轉(zhuǎn)字符串
NSString *dateStr = [formatter stringFromDate:date];

對比來看Swift

//初始化formatter對象
let formatter = DateFormatter.init()
//指定時區(qū)，東八區(qū)
formatter.locale = Locale.init(identifier: "zh_CN")
//類型轉(zhuǎn)換格式
formatter.dateFormat = "yyyy-MM-dd"
//字符串轉(zhuǎn)Date
let date = formatter.date(from: dateStr)!
//Date轉(zhuǎn)字符串
let dateStr = formatter.string(from: date)!