read_opc/reado-app/utils/date.js

//近一周时间
export function getLastWeek() {
	var now = new Date();
	var year = now.getFullYear();
	var month = now.getMonth() + 1; //0-11表示1-12月
	var day = now.getDate();
	if (month < 10) {
		month = '0' + month
	}
	if (day < 10) {
		day = '0' + day
	}
	var dateObj = [];
	dateObj[1] = year + '-' + month + '-' + day;
	if (day - 7 <= 0) { //如果在当月7日之前
		var lastMonthDay = new Date(year, (parseInt(month) - 1), 0).getDate(); //1周前所在月的总天数
		if (month - 1 <= 0) { //如果在当年的1月份
			dateObj[0] = (year - 1) + '-' + 12 + '-' + (31 - (7 - day));
		} else {
			if (Number(month) < 10) {
				dateObj[0] = year + '-' + '0' + (month - 1) + '-' + (lastMonthDay - (7 - day));
			} else {
				dateObj[0] = year + '-' + (month - 1) + '-' + (lastMonthDay - (7 - day));
			}
		}
	} else {
		dateObj[0] = year + '-' + month + '-' + (day - 7);
	}
	return dateObj;
}

//近一个月时间
export function getLastMonth() {
	var now = new Date();
	var year = now.getFullYear();
	var month = now.getMonth() + 1; //0-11表示1-12月
	var day = now.getDate();
	if (month < 10) {
		month = '0' + month
	}
	if (day < 10) {
		day = '0' + day
	}
	var dateObj = [];
	dateObj[1] = year + '-' + month + '-' + day;
	var nowMonthDay = new Date(year, month, 0).getDate(); //当前月的总天数
	if (month - 1 <= 0) { //如果是1月，年数往前推一年<br>　　　　 
		dateObj[0] = (year - 1) + '-' + 12 + '-' + day;
	} else {
		var lastMonthDay = new Date(year, (parseInt(month) - 1), 0).getDate();
		if (lastMonthDay < day) { // 1个月前所在月的总天数小于现在的天日期
			if (day < nowMonthDay) { //当前天日期小于当前月总天数
				dateObj[0] = year + '-' + (month - 1) + '-' + (lastMonthDay - (nowMonthDay - day));
			} else {
				dateObj[0] = year + '-' + (month - 1) + '-' + lastMonthDay;
			}
		} else {
			if (Number(month) < 10) {
				dateObj[0] = year + '-' + '0' + (month - 1) + '-' + day;
			} else {
				dateObj[0] = year + '-' + (month - 1) + '-' + day;
			}
		}
	}
	return dateObj;
}

//近三个月时间
export function getLast3Month() {
	var now = new Date();
	var year = now.getFullYear();
	var month = now.getMonth() + 1; //0-11表示1-12月
	var day = now.getDate();
	if (month < 10) {
		month = '0' + month
	}
	if (day < 10) {
		day = '0' + day
	}
	var dateObj = [];
	dateObj[1] = year + '-' + month + '-' + day;
	var nowMonthDay = new Date(year, month, 0).getDate(); //当前月的总天数
	if (month - 3 <= 0) { // 如果是1、2、3月，年数往前推一年
		var last3MonthDay = new Date((year - 1), (12 - (3 - parseInt(month))), 0).getDate(); // 3个月前所在月的总天数
		if (last3MonthDay < day) { // 3个月前所在月的总天数小于现在的天日期
			dateObj[0] = (year - 1) + '-' + (12 - (3 - month)) + '-' + last3MonthDay;
		} else {
			dateObj[0] = (year - 1) + '-' + (12 - (3 - month)) + '-' + day;
		}
	} else {
		var last3MonthDay = new Date(year, (parseInt(month) - 3), 0).getDate(); //3个月前所在月的总天数
		if (last3MonthDay < day) { //3个月前所在月的总天数小于现在的天日期
			if (day < nowMonthDay) { //当前天日期小于当前月总天数,2月份比较特殊的月份
				dateObj[0] = year + '-' + (month - 3) + '-' + (last3MonthDay - (nowMonthDay - day));
			} else {
				dateObj[0] = year + '-' + (month - 3) + '-' + last3MonthDay;
			}
		} else {
			if (Number(month) < 10) {
				dateObj[0] = year + '-' + '0' + (month - 3) + '-' + day;
			} else {
				dateObj[0] = year + '-' + (month - 3) + '-' + day;
			}
		}
	}
	return dateObj;
}

//近六个月时间
export function getLast6Month() {
	var now = new Date();
	var year = now.getFullYear();
	var month = now.getMonth() + 1; //0-11表示1-12月
	var day = now.getDate();
	if (month < 10) {
		month = '0' + month
	}
	if (day < 10) {
		day = '0' + day
	}
	var dateObj = [];
	dateObj[1] = year + '-' + month + '-' + day;
	var nowMonthDay = new Date(year, month, 0).getDate(); //当前月的总天数
	if (month - 6 <= 0) { // 如果是1、2、3、4、5、6月，年数往前推一年
		var last3MonthDay = new Date((year - 1), (12 - (6 - parseInt(month))), 0).getDate(); // 3个月前所在月的总天数
		if (last3MonthDay < day) { // 3个月前所在月的总天数小于现在的天日期
			dateObj[0] = (year - 1) + '-' + (12 - (6 - month)) + '-' + last3MonthDay;
		} else {
			dateObj[0] = (year - 1) + '-' + (12 - (6 - month)) + '-' + day;
		}
	} else {
		var last3MonthDay = new Date(year, (parseInt(month) - 6), 0).getDate(); //3个月前所在月的总天数
		if (last3MonthDay < day) { //3个月前所在月的总天数小于现在的天日期
			if (day < nowMonthDay) { //当前天日期小于当前月总天数,2月份比较特殊的月份
				dateObj[0] = year + '-' + (month - 6) + '-' + (last3MonthDay - (nowMonthDay - day));
			} else {
				dateObj[0] = year + '-' + (month - 6) + '-' + last3MonthDay;
			}
		} else {
			if (Number(month) < 10) {
				dateObj[0] = year + '-' + '0' + (month - 6) + '-' + day;
			} else {
				dateObj[0] = year + '-' + (month - 6) + '-' + day;
			}
		}
	}
	return dateObj;
}