text: //
  //  NSDate+fmt.h
  //  Demo
  //
  //  Created by 张文军 on 2018/11/12.
  //  Copyright © 2018 张文军. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  
  NS_ASSUME_NONNULL_BEGIN
  
  @interface NSDate (fmt)
  
  -(NSString *)timeIntervalString;
  -(NSString *)string4fmt:(NSString *)fmt;
  
  @end
  
  NS_ASSUME_NONNULL_END
  