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1、js获取当前日期（yyyy-mm-dd）
以下代码是获取到的当前日期：
var myDate = new Date(); var year = myDate.getFullYear(); //获取完整的年份(4位,1970-????)var month = myDate.getMonth()+1; //获取当前月份(1-12)var day = myDate.getDate(); //获取当前日(1-31)//获取完整年月日var newDay = year + “-” + month + “-” + day;
2、点击实现日期的天数加减（yyyy-mm-dd）
点击俩个按钮分别可以实现日期的加减，如果本月天数达到最多，那么月份将会自动增加或减少
var n = 0;dayChange(0)$("#time-add").click(function(){ n++; dayChange(n);})$("#time-less").click(function(){ n--; dayChange(n);})function dayChange(n){ var now = new Date();//今天 var tomo = new Date((now/1000+86400*n)*1000);//明天 var month = tomo.getMonth() + 1; var strDate = tomo.getDate(); var seperator1 = "-"; if (month >= 1 && month <= 9) { month = "0" + month; } if (strDate >= 0 && strDate <= 9) { strDate = "0" + strDate; } var currentdate = tomo.getFullYear() + seperator1 + month + seperator1 + strDate; $(".center-day").html(currentdate);}
3、获取当前本周周一和本周周日的时间范围
不管当前是周几，都可以获取到当前所在这一周的起始时间
var now = new Date();//今天 week(now); function week(now){ var nowTime = now.getTime() ; var day = now.getDay(); var oneDayLong = 24*60*60*1000 ; //获取本周所在周一 var MondayTime = nowTime - (day-1)*oneDayLong ; //获取本周所在周末 var SundayTime = nowTime + (7-day)*oneDayLong ; //转化日期 var monday = new Date(MondayTime); var sunday = new Date(SundayTime); var month = monday.getMonth() + 1; var strDate = monday.getDate(); var month1 = sunday.getMonth() + 1; var strDate1 = sunday.getDate(); if (month >= 1 && month <= 9) { month = "0" + month; } if (month1 >= 1 && month1 <= 9) { month1 = "0" + month1; } if (strDate >= 0 && strDate <= 9) { strDate = "0" + strDate; } if (strDate1 >= 0 && strDate1 <= 9) { strDate1 = "0" + strDate1; } currentdate = monday.getFullYear() + seperator1 + month + seperator1 + strDate + "至" + sunday.getFullYear() + seperator1 + month1 + seperator1 + strDate1; $(".center-day").html(currentdate);32}
4、点击实现每周范围的变化
点击改变的按钮将会改变显示一周范围的改变，如果有的在下一月或者下一年，那么将会自动显示，不会出现错误
var now = new Date();//今天var n = 0;week(now); $("#week-add").click(function(){ n++; var date = new Date(now.getTime() + n*7*24*3600*1000); week(date);})$("#week-add").click(function(){ n--; var date = new Date(now.getTime() + n*7*24*3600*1000); week(date);})function week(now){ var nowTime = now.getTime() ; var day = now.getDay(); var oneDayLong = 24*60*60*1000 ; //获取本周所在周一 var MondayTime = nowTime - (day-1)*oneDayLong ; //获取本周所在周末 var SundayTime = nowTime + (7-day)*oneDayLong ; 22//转化日期 var monday = new Date(MondayTime); var sunday = new Date(SundayTime); var month = monday.getMonth() + 1; var strDate = monday.getDate(); var month1 = sunday.getMonth() + 1; var strDate1 = sunday.getDate(); if (month >= 1 && month <= 9) { month = "0" + month; } if (month1 >= 1 && month1 <= 9) { month1 = "0" + month1; } if (strDate >= 0 && strDate <= 9) { strDate = "0" + strDate; } if (strDate1 >= 0 && strDate1 <= 9) { strDate1 = "0" + strDate1; } currentdate = monday.getFullYear() + seperator1 + month + seperator1 + strDate + "至" + sunday.getFullYear() + seperator1 + month1 + seperator1 + strDate1; $(".center-day").html(currentdate);}
5、获取当前月份的第一天和最后一天
能够获取到当前所在月份的第一天和最后一天，最后一天的日期是不固定的，能够获取到应有的日期
monthfen(0)function monthfen(n){ var now = new Date();//今天 var firstDate = new Date((now/1000+86400*n*now.getDate())*1000);//明天 //本月第一天 firstDate.setDate(1); //第一天 var date = new Date(firstDate); var month = date.getMonth() + 1; var strDate = "0" + date.getDate(); //本月最后一天 var endDate = new Date(firstDate); endDate.setMonth(firstDate.getMonth()+1); endDate.setDate(0); var date1 = new Date(endDate); var month1 = date1.getMonth() + 1; var strDate1 = date1.getDate(); if (month >= 1 && month <= 9) { month = "0" + month; } if (month1 >= 1 && month1 <= 9) { month1 = "0" + month1; } currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate + "至" + date1.getFullYear() + seperator1 + month1 + seperator1 + strDate1; $(".center-day").html(currentdate);}
6、点击实现当前月份的改变
点击按钮会实现当前月份的改变，那么最后一天的日期也会自动改变，
monthfen(0)var n = 0;$("#month-add").click(function(){ n++; monthfen(n);})$("#month-less").click(function(){ n--; monthfen(n);})function monthfen(n){ var now = new Date();//今天 var firstDate = new Date((now/1000+86400*n*now.getDate())*1000);//明天//本月第一天 firstDate.setDate(1); //第一天 var date = new Date(firstDate); var month = date.getMonth() + 1; var strDate = "0" + date.getDate();//本月最后一天 var endDate = new Date(firstDate); endDate.setMonth(firstDate.getMonth()+1); endDate.setDate(0); var date1 = new Date(endDate); var month1 = date1.getMonth() + 1; var strDate1 = date1.getDate(); if (month >= 1 && month <= 9) { month = "0" + month; } if (month1 >= 1 && month1 <= 9) { month1 = "0" + month1; } currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate + "至" + date1.getFullYear() + seperator1 + month1 + seperator1 + strDate1; $(".center-day").html(currentdate);}
当然还有很多关于日期格式的改变和算法，如果有什么不理解的可以留下评论，大家一起探讨。
以上这篇js实现日期显示的一些操作(实例讲解)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。