某个时间周期的头天或尾天
//本周的第一天 weekFirstDay: function (date) { var Nowdate = new Date(date); var WeekFirstDay = new Date(Nowdate - (Nowdate.getDay() - 1) * 86400000); M = Number(WeekFirstDay.getMonth()) + 1 M = M < 10 ? "0" + M : M; return WeekFirstDay.getFullYear() + "-" + M + "-" + WeekFirstDay.getDate(); }, //本周的最后一天 weekLastDay: function (date) { var Nowdate = new Date(date); var WeekFirstDay = new Date(Nowdate - (Nowdate.getDay() - 1) * 86400000); var WeekLastDay = new Date((WeekFirstDay / 1000 + 6 * 86400) * 1000); M = Number(WeekLastDay.getMonth()) + 1 M = M < 10 ? "0" + M : M; return WeekLastDay.getFullYear() + "-" + M + "-" + WeekLastDay.getDate(); }, //本月第一天 monthFirstDay: function () { var Nowdate = new Date(); var MonthFirstDay = new Date(Nowdate.getFullYear(), Nowdate.getMonth(), 1); M = Number(MonthFirstDay.getMonth()) + 1 M = M < 10 ? "0" + M : M; return MonthFirstDay.getFullYear() + "-" + M + "-" + MonthFirstDay.getDate(); }, //本月最后一天 monthLastDay: function () { var Nowdate = new Date(); var MonthNextFirstDay = new Date(Nowdate.getFullYear(), Nowdate.getMonth() + 1, 1); var MonthLastDay = new Date(MonthNextFirstDay - 86400000); M = Number(MonthLastDay.getMonth()) + 1 M = M < 10 ? "0" + M : M; return MonthLastDay.getFullYear() + "-" + M + "-" + MonthLastDay.getDate(); }, //上个月第一天 upMonthFirstDay: function () { var nowdays = new Date(); var year = nowdays.getFullYear(); var month = nowdays.getMonth(); if (month == 0) { month = 12; year = year - 1; } if (month < 10) { month = "0" + month; } return year + "-" + month + "-" + "01";//上个月的第一天 }, //上个月最后一天 upMonthLastDay: function () { var nowdays = new Date(); var year = nowdays.getFullYear(); var month = nowdays.getMonth(); if (month == 0) { month = 12; year = year - 1; } if (month < 10) { month = "0" + month; } //return year + "-" + month + "-" + "01";//上个月的第一天 var myDate = new Date(year, month, 0); return year + "-" + month + "-" + myDate.getDate();//上个月的最 }
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