js时间强制转换

// Date对象转换为时间戳
const date = new Date();
const timestamp = date.getTime(); // 或者使用 date.valueOf()

// 时间戳转换为Date对象
const timestamp = 1633072800000;
const date = new Date(timestamp);

const date = new Date();

// 使用 toISOString() 方法转换为 ISO 格式字符串
const isoString = date.toISOString(); // "2021-10-01T00:00:00.000Z"

// 自定义格式化函数
function formatDate(date) {
  const year = date.getFullYear();
  const month = ('0' + (date.getMonth() + 1)).slice(-2);
  const day = ('0' + date.getDate()).slice(-2);
  return `${year}-${month}-${day}`;
}

const formattedDate = formatDate(date); // "2021-10-01"

const date = new Date();

// 本地时间转换为UTC时间
const utcYear = date.getUTCFullYear();
const utcMonth = ('0' + (date.getUTCMonth() + 1)).slice(-2);
const utcDay = ('0' + date.getUTCDate()).slice(-2);
const utcString = `${utcYear}-${utcMonth}-${utcDay}T00:00:00Z`;

// UTC时间转换为本地时间
const utcDate = new Date('2021-10-01T00:00:00Z');
const localString = utcDate.toLocaleString();

const date1 = new Date('2021-10-01T00:00:00Z');
const date2 = new Date('2021-10-05T00:00:00Z');
const diffTime = Math.abs(date2 - date1); // 时间差，单位为毫秒
const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24)); // 时间差，单位为天