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）

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

/**

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 }

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使用方式：

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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