4
*
*/
5
function
getCurrentMonthIssue(date) {
6
let month = parseInt(date.getMonth() + 1
);
7
if
(month < 10
) {
8
month = '0' +
month
10
return
date.getFullYear() + "-" +
month;
11
}
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
}
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
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
}
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
}
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
}
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
