时间与时间戳

//获取当前时间

-(NSString*)getCurrentTime {
NSDateFormatter*formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:@"yyyMMddHHmmss"];
NSString * dateTime = [formatter stringFromDate:[NSDate date]];
NSLog(@"当前时间是===%@",dateTime);

return dateTime;

}
//2.获取当前时间戳

 -(NSString*)getCurrentTimestamp{

NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];

NSTimeInterval a=[dat timeIntervalSince1970];

NSString*timeString = [NSString stringWithFormat:@"%0.f", a];//转为字符型

NSLog(@"当前时间戳=====%@",timeString);
return timeString;

}

//3.把时间戳转化为时间

-(NSString*)SetTime:(NSString*)time{

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

[formatter setDateStyle:NSDateFormatterMediumStyle];

[formatter setTimeStyle:NSDateFormatterShortStyle];

[formatter setDateFormat:@"yyyMMdd"];

int timeval = [time intValue];

NSDate*confromTimesp = [NSDate dateWithTimeIntervalSince1970:timeval];

//     NSLog(@"1296035591  = %@",confromTimesp);

NSString*confromTimespStr = [formatter stringFromDate:confromTimesp];
NSLog(@"当前时间为======  %@",confromTimespStr);
return confromTimespStr;

}