// 1.获取时间
NSDate *date = [NSDate date];
NSLog(@"%@", date);
// 2.时间格式化
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy年MM月dd日 HH时mm分ss秒";
NSString *res = [dateFormatter stringFromDate:date];
NSLog(@"res = %@", res);
/****字符串转时间****/
NSString *str = @"2017-01-21 15:28:58 +0000";
NSDateFormatter *strDateFormatter = [[NSDateFormatter alloc] init];
strDateFormatter.dateFormat = @"yyyy-MM-dd- HH-mm-ss Z";
NSDate *strDate = [strDateFormatter dateFromString:str];
NSLog(@"strDate = %@", strDate);
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