js获取当天、本周、本月、本年的开始时间和结束时间

代码

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61

const currentStartEnd = {
  'day': function getCurrentDayStartEnd() {
    const d = new Date()
    return {
      s: new Date(d.setHours(0, 0, 0, 0)),
      e: new Date(d.setHours(23, 59, 59, 999))
    }
  },

  'week': function getCurrentWeekStartEnd() {
    const d = new Date()
    let n = d.getDay()
    if (n === 0) n = 7
    const num = 24 * 60 * 60 * 1000
    const s = startTime(d.valueOf() - (n - 1) * num)
    return {
      s: new Date(s),
      e: new Date(endTime(s + 6 * num))
    }
  },

  'month': function getCurrentMonthStartEnd() {
    const d = new Date()
    d.setDate(1)
    const s = new Date(startTime(d))
    const nm = d.getMonth() + 1
    const nf = new Date(d.getFullYear(), nm, 1)
    const num = 1 * 24 * 60 * 60 * 1000
    const e = new Date(endTime(nf - num))

    return {
      s,
      e
    }
  },
  'year': function getCurrentYearStartEnd() {
    const num = 1 * 24 * 60 * 60 * 1000
    const s = new Date()
    const e = new Date()
    s.setDate(1)
    s.setMonth(0)
    e.setFullYear(e.getFullYear() + 1)
    e.setDate(1)
    e.setMonth(0)

    return {s: new Date(startTime(s)), e: new Date(endTime(e - num))}
  },
}

function startTime(time) {
  return new Date(time).setHours(0, 0, 0, 0)
}

function endTime(time) {
  return new Date(time).setHours(23, 59, 59, 999)
}

function getStartEnd(unit) {
  return currentStartEnd[unit]()
}

结果

1
2
3
4
console.log(getStartEnd('day'))
console.log(getStartEnd('week'))
console.log(getStartEnd('month'))
console.log(getStartEnd('year'))