//string 转 date

+ (NSDate *)dateWithString:(NSString *)str dateFormater:(NSString *)dateFormat{

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

[formatter setDateFormat:dateFormat]; // 年-月-日 时:分:秒如@"yyyy-MM-dd hh:mm:ss"

NSDate * date = [formatter dateFromString:str];

return date;

}

//date 转 string

+ (NSString *)stringWithDate:(NSDate *)date dateFormater:(NSString *)dateFormat{

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

[formatter setDateFormat:dateFormat];

NSString *str = [formatter stringFromDate:date];

return str;

}

//字符串转时间戳

+(NSTimeInterval)dateStrToInterval:(NSString *)dateStr dateFormater:(NSString *)dateFormat{

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

[fo setDateFormat:dateFormat];

NSDate *da = [fo dateFromString:dateStr];

if( da == nil )

return ;

return da.timeIntervalSince1970;

}

//时间戳转字符串

+(NSString*)dateIntervalToString:(NSTimeInterval)timeInterval dateFormater:(NSString *)dateFormat{

if( !dateFormat )

return nil;

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

[fo setDateFormat:dateFormat];

NSDate *da = [NSDate dateWithTimeIntervalSinceNow:(timeInterval+)/];

// [fo setDateStyle:kCFDateFormatterNoStyle];

NSString *daStr = [fo stringFromDate:da];

return daStr;

}