118 lines
3.3 KiB
JavaScript
118 lines
3.3 KiB
JavaScript
// 日期格式化函数 by liaody 2025-3-5
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// 使用示例
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///const now = new Date();
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//const formattedDate = formatDate(now);
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//console.log(formattedDate);
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function formatDate(date, format = 'YYYY-MM-DD') {
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if (!(date instanceof Date)) {
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date = new Date(date);
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}
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const year = date.getFullYear();
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const month = String(date.getMonth() + 1).padStart(2, '0');
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const day = String(date.getDate()).padStart(2, '0');
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const hour = String(date.getHours()).padStart(2, '0');
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const minute = String(date.getMinutes()).padStart(2, '0');
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const second = String(date.getSeconds()).padStart(2, '0');
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return format
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.replace('YYYY', year)
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.replace('MM', month)
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.replace('DD', day)
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.replace('HH', hour)
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.replace('mm', minute)
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.replace('ss', second);
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}
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// 计算两个日期之间相差的天数
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// 使用示例
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// const dateA = '2025-01-01';
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// const dateB = '2025-01-10';
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// const daysDiff = getDaysDifference(dateA, dateB);
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// console.log(daysDiff);
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function getDaysDifference(date1, date2) {
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const oneDay = 24 * 60 * 60 * 1000; // 一天的毫秒数
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const firstDate = new Date(date1);
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const secondDate = new Date(date2);
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const diffDays = Math.round(Math.abs((firstDate - secondDate) / oneDay));
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return diffDays;
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}
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// 使用示例
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// const startDate = '2025-03-01';
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// const daysToAdd = 5;
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// const futureDate = getDateAfterDays(startDate, daysToAdd);
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// const formattedFutureDate = formatDate(futureDate);
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// console.log(formattedFutureDate);
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// 获取指定日期之后 n 天的日期
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function getDateAfterDays(date, days) {
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const newDate = new Date(date);
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newDate.setDate(newDate.getDate() + days);
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return newDate;
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}
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function getDateAfterMonths(date, months) {
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const newDate = new Date(date);
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const originalDate = date.getDate();
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// 保存原始年月日
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const originalYear = date.getFullYear();
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const originalMonth = date.getMonth();
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// 计算目标年月
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const totalMonths = originalMonth + months;
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const expectedYear = originalYear + Math.floor(totalMonths / 12);
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const expectedMonth = totalMonths % 12;
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// 尝试设置新月份
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newDate.setMonth(totalMonths);
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// 处理月末边界情况
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if (
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newDate.getFullYear() !== expectedYear ||
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newDate.getMonth() !== expectedMonth
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) {
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// 当设置月份失败时（如1月31日设置到2月）
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// 设置为目标月份的最后一天
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newDate.setFullYear(expectedYear, expectedMonth + 1, 0);
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} else if (newDate.getDate() !== originalDate) {
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// 当日期自动变化时（如1月30日设置到2月）
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// 同样设置为目标月份的最后一天
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newDate.setDate(0);
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}
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return newDate;
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}
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//计算当前日期占全年的进度数据
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// 示例用法
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// console.log(getYearProgress()); // 输出如 "35.42%"
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function getYearProgress() {
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const now = new Date(); // 当前时间
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const year = now.getFullYear();
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// 关键时间点
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const yearStart = new Date(year, 0, 1); // 当年1月1日
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const nextYearStart = new Date(year + 1, 0, 1); // 下一年1月1日
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// 计算时间差（毫秒）
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const totalMs = nextYearStart - yearStart; // 全年总时长
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const passedMs = now - yearStart; // 已过时长
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// 计算百分比（保留2位小数）
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const progress = ((passedMs / totalMs) * 100).toFixed(2);
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return parseFloat(progress);
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}
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export {
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formatDate,
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getDateAfterDays,
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getDaysDifference,
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getDateAfterMonths,
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getYearProgress
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} |