another-calendar

README.md

deno run https://gist.githubusercontent.com/rockonyu/be1354fbc86771370c4602e65b086cf1/raw/5ecbda5423ae52f6687647d9f580b5c537ddfe5b/another-calendar-2.ts 2020

another-calendar-1.ts

const totalCells = 42;
const startDay = 0;

const addDays = (date: Date, days: number) => {
  return new Date(new Date(date).setDate(date.getDate() + days));
};

const render = (year: number, month: number) => {
  const firstDate = new Date(year, month, 1);
  const lastDate = new Date(year, month + 1, 0);
  const startDateOnCalendar = addDays(firstDate, startDay - firstDate.getDay());

  let output = "";
  for (let i = 0; i < totalCells; i++) {
    const currentDate = addDays(startDateOnCalendar, i);

    let formatStr = `00${currentDate.getDate()} `.slice(-3);

    if (currentDate >= firstDate && currentDate <= lastDate) {
      formatStr = formatStr.replace(" ", ".");
    }

    output += formatStr;

    if (i % 7 === 6) {
      console.log(output);
      output = "";
    }
  }
};

for (let i = 0; i < 12; i++) {
  console.log(`======= ${i + 1}月 =======`);
  render(2020, i);
}

another-calendar-2.ts

type FullYear = {
  year: number;
  months: Array<number[]>;
};

const processYear = (year: number): FullYear => {
  const fullYear: FullYear = {
    year,
    months: [],
  };

  for (let i = 0; i < 12; i++) {
    const month = [];
    const firstDate = new Date(year, i, 1);
    const lastDate = new Date(year, i + 1, 0);
    const offset = firstDate.getDay();

    for (let j = 0; j < lastDate.getDate(); j++) {
      month[j + offset] = j + 1;
    }

    fullYear.months.push(month);
  }

  return fullYear;
};

const render = (queryYear: number) => {
  const { year, months } = processYear(queryYear);
  const totalCells = 42;

  console.log(`\n${year}:`);

  for (let counter = 0; counter < months.length; counter++) {
    console.log(`\n${counter + 1} 月`);

    let currentLine = "";

    for (let cell = 0; cell < totalCells; cell++) {
      const day = months[counter][cell]
        ? `  ${months[counter][cell]} `.slice(-3)
        : "___";

      currentLine += day;

      if (cell % 7 === 6) {
        console.log(currentLine);
        currentLine = "";
      }
    }
  }
};

const year = +Deno.args[0] || new Date().getFullYear();

console.time("process");
render(year);
console.timeEnd("process");