iOS中时间与时间戳的相互转化

//获取当前系统时间的时间戳

#pragma mark - 获取当前时间的 时间戳

+(NSInteger)getNowTimestamp

{

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

    [formatter setDateStyle:NSDateFormatterMediumStyle];

    [formatter setTimeStyle:NSDateFormatterShortStyle];

　 //设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制

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

    //设置时区,这个对于时间的处理有时很重要

    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

    [formatter setTimeZone:timeZone];

    //现在时间

    NSDate *datenow = [NSDate date];

    NSLog(@"设备当前的时间:%@",[formatter stringFromDate:datenow]);

    //时间转时间戳的方法:

    NSInteger timeSp = [[NSNumber numberWithDouble:[datenow timeIntervalSince1970]] integerValue];

    NSLog(@"设备当前的时间戳:%ld",(long)timeSp); //时间戳的值

    return timeSp;

}

//将某个时间转化成时间戳

#pragma mark - 将某个时间转化成时间戳

+(NSInteger)timeSwitchTimestamp:(NSString *)formatTime andFormatter:(NSString *)format

{

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

    [formatter setDateStyle:NSDateFormatterMediumStyle];

    [formatter setTimeStyle:NSDateFormatterShortStyle];

　 //(@"YYYY-MM-dd hh:mm:ss")设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制

    [formatter setDateFormat:format]; 

    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

    [formatter setTimeZone:timeZone];

    //将字符串按formatter转成nsdate

    NSDate* date = [formatter dateFromString:formatTime]; 

    //时间转时间戳的方法:

    NSInteger timeSp = [[NSNumber numberWithDouble:[date timeIntervalSince1970]] integerValue];

    NSLog(@"将某个时间转化成 时间戳&&&&&&&timeSp:%ld",(long)timeSp); //时间戳的值

    return timeSp;

}

//将某个时间戳转化成时间

#pragma mark - 将某个时间戳转化成 时间

+(NSString *)timestampSwitchTime:(NSInteger)timestamp andFormatter:(NSString *)format

{

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

    [formatter setDateStyle:NSDateFormatterMediumStyle];

    [formatter setTimeStyle:NSDateFormatterShortStyle];

    //（@"YYYY-MM-dd hh:mm:ss"）设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制

    [formatter setDateFormat:format]; 

    NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"Asia/Beijing"];

    [formatter setTimeZone:timeZone];

    NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:timestamp];

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

    NSString *confromTimespStr = [formatter stringFromDate:confromTimesp];

    //NSLog(@"&&&&&&&confromTimespStr = : %@",confromTimespStr);

    return confromTimespStr;

}