NSDate转时间

+ (NSString *)dateStringFromDate:(NSDate *)date formate:(NSString *)formate;{
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:formate];
    NSString *dateString = [formatter stringFromDate:date];
    return dateString;
}

时间转成NSDate

+ (NSDate *)dateFormDateString:(NSString *)dateString formate:(NSString *)formate{
    NSDateFormatter *fotmatter = [[NSDateFormatter alloc] init];
    [fotmatter setDateFormat:formate];
    NSDate *date = [fotmatter dateFromString:dateString];
    return date;
}

+ (double)timeForDate:(NSDate *)date
{
    double time = [date timeIntervalSince1970];
    return time;
}
+ (NSString *)datefromTime:(long)tiem
{
    NSDate *date = [NSDate dateWithTimeIntervalSince1970:tiem];
   return [HHTool dateStringFromDate:date formate:@"yyyyMMdd"];
}

时间转时间戳

+ (double)timeForDateString:(NSString *)dateString
{
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyyMMdd"];
    NSDate *date = [formatter dateFromString:dateString];
    return [HHTool timeForDate:date];
}

美国时间转成中国时间 //Sat Jan 12 11:50:16 +0800 2013

+ (NSString *)formateString:(NSString *)dateString
{
    NSString *formate = @"E MMM d HH:mm:ss Z yyyy";
    NSDate *date = [HHTool dateFormDateString:dateString formate:formate];
    NSString *dateStr = [HHTool dateStringFromDate:date formate:@"MM-dd:HH:mm"];
    return dateStr;
}