//初始化时间
NSDate * today = [NSDate date];
NSDateFormatter * formatter = [[NSDateFormatteralloc]init];
[formatter setDateFormat:@"YYYY-MM-dd"];
dateFrom.text = [formatter stringFromDate:today];
将字符串dateStr转化为nsdateNSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"y-M-d HH:mm:ss"]; NSDate *date=[dateFormatter dateFromString:dateStr];
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