JS 获取（期号、当前日期、本周第一天、最后一天及当前月第一、最后天函数
1 /** 2 * 获取当前月期号 3 * 返回格式: YYYY-mm 4 * */ 5 function getCurrentMonthIssue(date) { 6 let month = parseInt(date.getMonth() + 1); 7 if (month < 10) { 8 month = '0' + month 9 } 10 return date.getFullYear() + "-" + month; 11 } 12 13 /** 14 * 获取当前的日期 15 * 返回格式: YYYY-mm-dd 16 * */ 17 function getCurrentDate(date) { 18 let month = parseInt(date.getMonth() + 1); 19 let day = date.getDate(); 20 if (month < 10) { 21 month = '0' + month 22 } 23 if (day < 10) { 24 day = '0' + day 25 } 26 return date.getFullYear() + '-' + month + '-' + day; 27 } 28 29 /** 30 * 获取本周的第一天 31 * 返回格式: YYYY-mm-dd 32 * 例子: 当日为: 2020-11-27 33 * 返回日期为: 2020-11-23 34 * */ 35 function getCurrentWeekFirstDay(date) { 36 let weekFirstDay = new Date(date - (date.getDay() - 1) * 86400000) 37 let firstMonth = Number(weekFirstDay.getMonth()) + 1 38 39 if (firstMonth < 10) { 40 firstMonth = '0' + firstMonth 41 } 42 let weekFirstDays = weekFirstDay.getDate(); 43 if (weekFirstDays < 10) { 44 weekFirstDays = '0' + weekFirstDays; 45 } 46 return weekFirstDay.getFullYear() + '-' + firstMonth + '-' + weekFirstDays; 47 } 48 49 /** 50 * 获取本周的最后一天 51 * 返回格式: YYYY-mm-dd 52 * 例子: 当日为: 2020-11-27 53 * 返回日期为: 2020-11-29 54 * */ 55 function getCurrentWeekLastDay(date) { 56 let weekFirstDay = new Date(date - (date.getDay() - 1) * 86400000) 57 let weekLastDay = new Date((weekFirstDay / 1000 + 6 * 86400) * 1000) 58 let lastMonth = Number(weekLastDay.getMonth()) + 1 59 if (lastMonth < 10) { 60 lastMonth = '0' + lastMonth 61 } 62 let weekLastDays = weekLastDay.getDate(); 63 if (weekLastDays < 10) { 64 weekLastDays = '0' + weekLastDays; 65 } 66 return weekFirstDay.getFullYear() + '-' + lastMonth + '-' + weekLastDays; 67 } 68 69 /** 70 * 获取当前月的第一天 71 * 返回格式: YYYY-mm-dd 72 * 例子: 当日为: 2020-11-27 73 * 返回日期为: 2020-11-01 74 * */ 75 function getCurrentMonthFirstDay() { 76 let date = new Date(); 77 date.setDate(1); 78 let month = parseInt(date.getMonth() + 1); 79 let day = date.getDate(); 80 if (month < 10) { 81 month = '0' + month 82 } 83 if (day < 10) { 84 day = '0' + day 85 } 86 return date.getFullYear() + '-' + month + '-' + day; 87 } 88 89 /** 90 * 获取当前月的最后一天 91 * 返回格式: YYYY-mm-dd 92 * 例子: 当日为: 2020-11-27 93 * 返回日期为: 2020-11-30 94 * */ 95 function getCurrentMonthLastDay() { 96 let date = new Date(); 97 let currentMonth = date.getMonth(); 98 let nextMonth = ++currentMonth; 99 let nextMonthFirstDay = new Date(date.getFullYear(), nextMonth, 1); 100 let oneDay = 1000 * 60 * 60 * 24; 101 let lastTime = new Date(nextMonthFirstDay - oneDay); 102 let month = parseInt(lastTime.getMonth() + 1); 103 let day = lastTime.getDate(); 104 if (month < 10) { 105 month = '0' + month 106 } 107 if (day < 10) { 108 day = '0' + day 109 } 110 return date.getFullYear() + '-' + month + '-' + day; 111 }
使用方式：
1 let date = new Date(); 2 // 例当日时间是 2020-11-27 3 getCurrentMonthIssue(date); // result: 2020-11 --期号 4 getCurrentDate(date); // result: 2020-11-27 --当前日期 5 getCurrentWeekFirstDay(date); // result: 2020-11-23 --本周第一天时间 6 getCurrentWeekLastDay(date); // result: 2020-11-29 --本周最后一天时间 7 getCurrentMonthFirstDay(date); // result: 2020-11-01 --本月第一天时间 8 getCurrentMonthLastDay(date); // result: 2020-11-30 --本月最后一天时间