iOS 时间

1.获取系统当前时间

NSDate *  senddate=[NSDate date];

NSDateFormatter  *dateformatter=[[NSDateFormatter alloc] init];

[dateformatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

NSString * str=[dateformatter stringFromDate:senddate];

2.获取当前系统时间的秒数

NSTimeInterval time = [[NSDate date] timeIntervalSince1970];

long long int date = (long long int)time;

3.以秒数来获取的时间

NSDate * d=[NSDate dateWithTimeIntervalSince1970:date];

NSDateFormatter * dateformatter=[[NSDateFormatter alloc] init];

[dateformatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSString * s=[dateformatter stringFromDate:d];