text: 
  const {date_diff} = require("../function/date_diff.js");
  
  test("test date_create()", ()=>{
  	const d = new Date(2022, 0, 10, 12, 23,34 );
  	const target_d = new Date(2023, 0, 11, 13, 21,31 );
  
  	expect(date_diff(d, target_d)).toStrictEqual(31625877);
  	expect(date_diff(target_d, d)).toStrictEqual(-31625877);
  	expect(date_diff(target_d, d, true)).toStrictEqual(31625877);
  })