IOS将时间字符串转化成时间戳

+(long64) CurTimeMilSec:(NSString*)pstrTime
{
    NSDateFormatter *pFormatter= [[NSDateFormatter alloc]init];
    [pFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate *pCurrentDate = [pFormatter dateFromString:pstrTime];
    return [pCurrentDate timeIntervalSince1970] * 1000;
}

/**
 *   将时间字符串转化成毫秒
 *
 *  @param pstrTime 时间字符串
 *
 *  @return 转化成毫秒的字符串
 */