// 獲取當前時間
let currentTime = new Date();
// 獲取年份
let year = currentTime.getFullYear();
// 獲取月份（注意月份是從0開始計數(shù)的，所以需要加1）
let month = currentTime.getMonth() + 1;
// 獲取日期
let day = currentTime.getDate();
// 獲取小時
let hours = currentTime.getHours();
// 獲取分鐘
let minutes = currentTime.getMinutes();
// 獲取秒數(shù)
let seconds = currentTime.getSeconds();
// 獲取毫秒數(shù)
let milliseconds = currentTime.getMilliseconds();
// 格式化時間為 YYYY-MM-DD
let formattedDate = `${year}-${month.toString().padStart(2, '0')}-${day.toString().padStart(2, '0')}`;
// 格式化時間為 HH:MM:SS
let formattedTime = `${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
// 格式化時間為 YYYY-MM-DD HH:MM:SS
let formattedDateTime = `${formattedDate} ${formattedTime}`;
// 格式化時間為 MM/DD/YYYY
let formattedDateUS = `${month.toString().padStart(2, '0')}/${day.toString().padStart(2, '0')}/${year}`;
// 格式化時間為 HH:MM AM/PM
let formattedTime12Hour = `${hours % 12 || 12}:${minutes.toString().padStart(2, '0')} ${hours < 12 ? 'AM' : 'PM'}`;
console.log('當前時間：', currentTime);
console.log('年份：', year);
console.log('月份：', month);
console.log('日期：', day);
console.log('小時：', hours);
console.log('分鐘：', minutes);
console.log('秒數(shù)：', seconds);
console.log('毫秒數(shù)：', milliseconds);
console.log('格式化日期：', formattedDate);
console.log('格式化時間：', formattedTime);
console.log('格式化日期時間：', formattedDateTime);
console.log('格式化日期（美國格式）：', formattedDateUS);
console.log('格式化12小時制時間：', formattedTime12Hour);

function getMonthDates() {
  let today = new Date();
  let year = today.getFullYear();
  let month = today.getMonth();
  let startOfMonth = new Date(year, month, 1);
  let endOfMonth = new Date(year, month + 1, 0);
  let startOfLastMonth = new Date(year, month - 1, 1);
  let endOfLastMonth = new Date(year, month, 0);
  return {
    startOfMonth,
    endOfMonth,
    startOfLastMonth,
    endOfLastMonth,
  };
}
// 調(diào)用函數(shù)獲取本月和上月的日期范圍
let monthDates = getMonthDates();
console.log('本月的開始日期：', monthDates.startOfMonth);
console.log('本月的結(jié)束日期：', monthDates.endOfMonth);
console.log('上月的開始日期：', monthDates.startOfLastMonth);
console.log('上月的結(jié)束日期：', monthDates.endOfLastMonth);

function getQuarterDates() {
  let today = new Date();
  let year = today.getFullYear();
  let month = today.getMonth();
  let quarter = Math.floor(month / 3) + 1;
  let startOfQuarter = new Date(year, (quarter - 1) * 3, 1);
  let endOfQuarter = new Date(year, quarter * 3, 0);
  let startOfLastQuarter = new Date(year, (quarter - 2) * 3, 1);
  let endOfLastQuarter = new Date(year, (quarter - 1) * 3, 0);
  return {
    startOfQuarter,
    endOfQuarter,
    startOfLastQuarter,
    endOfLastQuarter,
  };
}
// 調(diào)用函數(shù)獲取本季度和上季度的日期范圍
let quarterDates = getQuarterDates();
console.log('本季度的開始日期：', quarterDates.startOfQuarter);
console.log('本季度的結(jié)束日期：', quarterDates.endOfQuarter);
console.log('上季度的開始日期：', quarterDates.startOfLastQuarter);
console.log('上季度的結(jié)束日期：', quarterDates.endOfLastQuarter);

function getLastYearDates() {
  let today = new Date();
  let year = today.getFullYear();
  let startOfYear = new Date(year - 1, 0, 1);
  let endOfYear = new Date(year - 1, 11, 31);
  return {
    startOfYear,
    endOfYear,
  };
}
// 調(diào)用函數(shù)獲取上一年的日期范圍
let lastYearDates = getLastYearDates();
console.log('上一年的開始日期：', lastYearDates.startOfYear);
console.log('上一年的結(jié)束日期：', lastYearDates.endOfYear);

function getDateRange() {
  let today = new Date();
  let year = today.getFullYear();
  let month = today.getMonth();
  let quarter = Math.floor(month / 3);
  let startOfMonth = new Date(year, month, 1);
  let endOfMonth = new Date(year, month + 1, 0);
  let startOfLastMonth = new Date(year, month - 1, 1);
  let endOfLastMonth = new Date(year, month, 0);
  let startOfQuarter = new Date(year, quarter * 3, 1);
  let endOfQuarter = new Date(year, quarter * 3 + 3, 0);
  let startOfLastQuarter = new Date(year, (quarter - 1) * 3, 1);
  let endOfLastQuarter = new Date(year, quarter * 3, 0);
  let startOfYear = new Date(year, 0, 1);
  let endOfYear = new Date(year, 11, 31);
  return {
    startOfMonth,
    endOfMonth,
    startOfLastMonth,
    endOfLastMonth,
    startOfQuarter,
    endOfQuarter,
    startOfLastQuarter,
    endOfLastQuarter,
    startOfYear,
    endOfYear,
  };
}
// 調(diào)用函數(shù)獲取日期范圍
let dateRange = getDateRange();
console.log('本月的開始日期：', dateRange.startOfMonth);
console.log('本月的結(jié)束日期：', dateRange.endOfMonth);
console.log('上月的開始日期：', dateRange.startOfLastMonth);
console.log('上月的結(jié)束日期：', dateRange.endOfLastMonth);
console.log('本季度的開始日期：', dateRange.startOfQuarter);
console.log('本季度的結(jié)束日期：', dateRange.endOfQuarter);
console.log('上季度的開始日期：', dateRange.startOfLastQuarter);
console.log('上季度的結(jié)束日期：', dateRange.endOfLastQuarter);
console.log('本年度的開始日期：', dateRange.startOfYear);
console.log('本年度的結(jié)束日期：', dateRange.endOfYear);