原文：/wordpress/?p=332
1.js得到今天日期、本周、本月、本年起始和结束日期，得到今天、昨天、明天日期。
function getDate(dates) {var dd = new Date();var n = dates || 0;dd.setDate(dd.getDate() + n);var y = dd.getFullYear();var m = dd.getMonth() + 1;var d = dd.getDate();m = m < 10 ? "0" + m: m;d = d < 10 ? "0" + d: d;var day = y + "-" + m + "-" + d;return day;};getDate(dates) //dates为数字类型，0代表今日,-1代表昨日，1代表明日，返回yyyy-mm-dd格式字符串，dates不传默认代表今日。
2.得到本周、上周、下周的起始、结束日期
function getMonday(type, dates) {var now = new Date();var nowTime = now.getTime();var day = now.getDay();var longTime = 24 * 60 * 60 * 1000;var n = longTime * 7 * (dates || 0);if (type == "s") {var dd = nowTime - (day - 1) * longTime + n;};if (type == "e") {var dd = nowTime + (7 - day) * longTime + n;};dd = new Date(dd);var y = dd.getFullYear();var m = dd.getMonth() + 1;var d = dd.getDate();m = m < 10 ? "0" + m: m;d = d < 10 ? "0" + d: d;var day = y + "-" + m + "-" + d;return day;};getMonday(type,dates) //type为字符串类型，有两种选择，"s"代表开始,"e"代表结束，dates为数字类型，不传或0代表本周，-1代表上周，1代表下周getMonday("s",1) //得到下周一的yyyy-mm-dd格式日期getMonday("e",1) //得到下周日的yyyy-mm-dd格式日期
3.得到本月、上月、下月的起始、结束日期
function getMonth(type, months) {var d = new Date();var year = d.getFullYear();var month = d.getMonth() + 1;if (Math.abs(months) > 12) {months = months % 12;};if (months != 0) {if (month + months > 12) {year++;month = (month + months) % 12;} else if (month + months < 1) {year--;month = 12 + month + months;} else {month = month + months;};};month = month < 10 ? "0" + month: month;var date = d.getDate();var firstday = year + "-" + month + "-" + "01";var lastday = "";if (month == "01" || month == "03" || month == "05" || month == "07" || month == "08" || month == "10" || month == "12") {lastday = year + "-" + month + "-" + 31;} else if (month == "02") {if ((year % 4 == 0 && year % 100 != 0) || (year % 100 == 0 && year % 400 == 0)) {lastday = year + "-" + month + "-" + 29;} else {lastday = year + "-" + month + "-" + 28;};} else {lastday = year + "-" + month + "-" + 30;};var day = "";if (type == "s") {day = firstday;} else {day = lastday;};return day;};getMonth(type,months) //type为字符串类型，有两种选择，"s"代表开始,"e"代表结束，months为数字类型，不传或0代表本月，-1代表上月，1代表下月getMonth("s",1) //得到下月第一天的yyyy-mm-dd格式日期getMonth("e",1) //得到下月最后一天的yyyy-mm-dd格式日期
4.得到今年、去年、明年的开始、结束日期
function getYear(type, dates) {var dd = new Date();var n = dates || 0;var year = dd.getFullYear() + Number(n);if (type == "s") {var day = year + "-01-01";};if (type == "e") {var day = year + "-12-31";};if (!type) {var day = year + "-01-01/" + year + "-12-31";};return day;};getYear(type,dates) //type为字符串类型，有两种选择，"s"代表开始,"e"代表结束，dates为数字类型，不传或0代表今年，-1代表去年，1代表明年getYear("s",1) //得到明年第一天的yyyy-mm-dd格式日期getYear("e",1) //得到明年最后一天的yyyy-mm-dd格式日期
5.得到本季度的开始、结束日期
function getQuarterMonth(type){ var now = new Date();var nowMonth = now.getMonth();var year = now.getFullYear();var quarterStartMonth = 1; if(nowMonth<3){ quarterStartMonth = 1; } if(2<nowMonth && nowMonth<6){ quarterStartMonth = 4; } if(5<nowMonth && nowMonth<9){ quarterStartMonth = 7; } if(nowMonth>8){ quarterStartMonth = 10; }if (type == "s") {var day = year+"-"+quarterStartMonth+"-01";};//1-3 4-6 7-9 10-12if (type == "e") {if(quarterStartMonth==1){var day = year+"-"+(quarterStartMonth+2)+"-31";}if(quarterStartMonth==10){var day = year+"-"+(quarterStartMonth+2)+"-31";}if(quarterStartMonth==4){var day = year+"-"+(quarterStartMonth+2)+"-30";}if(quarterStartMonth==7){var day = year+"-"+(quarterStartMonth+2)+"-30";}};return day; }getQuarterMonth("s",1) //得到本季度第一天的yyyy-mm-dd格式日期getQuarterMonth("e",1) //得到本季度最后一天的yyyy-mm-dd格式日期
