Get the start time and end time of the current month half a year ago

HTML

HelloClick

JS

function getWhatDate(str) { //A parameter is passed as the start time, and no parameter is passed as the end time// Get timestamp and data period // Start time, format yyyy - MM - dd HH: mm: ssvar nowdate = new Date();var halfYearDate = new Date(Date.now() - (365 / 2 * 24 * 3600 * 1000));if (str) {timeDate = getdate(halfYearDate, str)} else {timeDate = getdate(nowdate)}function getdate(date, str) {// Y = date.getFullYear() + '-';// M = (date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1) + '-';// D = (date.getDate() < 10 ? '0' + date.getDate() : date.getDate()) + ' ';// h = (date.getHours() < 10 ? '0' + date.getHours() : date.getHours()) + ':';// m = (date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes()) + ':';// s = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds()Y = date.getFullYear();M = (date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1);D = (date.getDate() < 10 ? '0' + date.getDate() : date.getDate());h = (date.getHours() < 10 ? '0' + date.getHours() : date.getHours());m = (date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes());s = date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds()if (str) {if (M <= 11) {return Y + '-' + (M + 1) + '-' + '01 00:00:00';} else {return (Y + 1) + '-' + '01-01 00:00:00';}} else {return Y + '-' + M + '-' + D + ' 23:59:59';}}return timeDate}$("button").on("click",function(){var time = getWhatDate('start')var end = getWhatDate()console.log(time,end)})