/**
 獲取當(dāng)前時(shí)間

 @return <#return value description#>
 */
-(NSString *)currentDateStr{

    NSDate * currentDate = [NSDate date];//獲取當(dāng)前的時(shí)間日期
    
    NSDateFormatter * dateFormatter = [[NSDateFormatter  alloc] init];// 創(chuàng)建一個(gè)時(shí)間格式化對(duì)象
    
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];//YYYYMMdd//yyyy-MM-dd HH:mm:ss//設(shè)定時(shí)間格式,這里可以設(shè)置成自己需要的格式
    
    NSString * dateString=[dateFormatter stringFromDate:currentDate];
    
    return dateString;
    
}

/**
獲取當(dāng)前時(shí)間戳

@return <#return value description#>
*/
-(NSString *)currentTimeStr{

   NSDate* date = [NSDate dateWithTimeIntervalSinceNow:0];//獲取當(dāng)前時(shí)間0秒后的時(shí)間
   NSTimeInterval time=[date timeIntervalSince1970]*1000;// *1000 是精確到毫秒，不乘就是精確到秒
   NSString *timeString = [NSString stringWithFormat:@"%.0f", time];
   return timeString;
}

/**
時(shí)間戳轉(zhuǎn)時(shí)間,時(shí)間戳為13位是精確到毫秒的，10位精確到秒

@param str <#str description#>
@return <#return value description#>
*/
- (NSString *)getDateStringWithTimeStr:(NSString *)str{
   NSTimeInterval time=[str doubleValue]/1000;//傳入的時(shí)間戳str如果是精確到毫秒的記得要/1000
   NSDate *detailDate=[NSDate dateWithTimeIntervalSince1970:time];
   NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; //實(shí)例化一個(gè)NSDateFormatter對(duì)象
   //設(shè)定時(shí)間格式,這里可以設(shè)置成自己需要的格式
   [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss SS"];
   NSString *currentDateStr = [dateFormatter stringFromDate: detailDate];
   return currentDateStr;
}

//字符串轉(zhuǎn)時(shí)間戳 如：2017-4-10 17:15:10
- (NSString *)getTimeStrWithString:(NSString *)str{
   NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];// 創(chuàng)建一個(gè)時(shí)間格式化對(duì)象
   [dateFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"]; //設(shè)定時(shí)間的格式
   NSDate *tempDate = [dateFormatter dateFromString:str];//將字符串轉(zhuǎn)換為時(shí)間對(duì)象
   NSString *timeStr = [NSString stringWithFormat:@"%ld", (long)[tempDate timeIntervalSince1970]*1000];//字符串轉(zhuǎn)成時(shí)間戳,精確到毫秒*1000
   return timeStr;
}