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
import * as C from './constant'
const padStart = (string, length, pad) => {  const s = String(string)  if (!s || s.length >= length) return string  return `${Array((length + 1) - s.length).join(pad)}${string}`}
const padZoneStr = (instance) => {  const negMinutes = -instance.utcOffset()  const minutes = Math.abs(negMinutes)  const hourOffset = Math.floor(minutes / 60)  const minuteOffset = minutes % 60  return `${negMinutes <= 0 ? '+' : '-'}${padStart(hourOffset, 2, '0')}:${padStart(minuteOffset, 2, '0')}`}
const monthDiff = (a, b) => {  // function from moment.js in order to keep the same result  if (a.date() < b.date()) return -monthDiff(b, a)  const wholeMonthDiff = ((b.year() - a.year()) * 12) + (b.month() - a.month())  const anchor = a.clone().add(wholeMonthDiff, C.M)  const c = b - anchor < 0  const anchor2 = a.clone().add(wholeMonthDiff + (c ? -1 : 1), C.M)  return +(-(wholeMonthDiff + ((b - anchor) / (c ? (anchor - anchor2) :    (anchor2 - anchor)))) || 0)}
const absFloor = n => (n < 0 ? Math.ceil(n) || 0 : Math.floor(n))
const prettyUnit = (u) => {  const special = {    M: C.M,    y: C.Y,    w: C.W,    d: C.D,    D: C.DATE,    h: C.H,    m: C.MIN,    s: C.S,    ms: C.MS,    Q: C.Q  }  return special[u] || String(u || '').toLowerCase().replace(/s$/, '')}
const isUndefined = s => s === undefined
export default {  s: padStart,  z: padZoneStr,  m: monthDiff,  a: absFloor,  p: prettyUnit,  u: isUndefined}