fix: Duration add/subtract #2336

src/plugin/duration/index.js

@@ -258,13 +258,13 @@ class Duration {
 }
 
 const manipulateDuration = (date, duration, k) =>
-  date.add(duration.years() * k, 'year')
-    .add(duration.months() * k, 'month')
-    .add(duration.days() * k, 'day')
-    .add(duration.hours() * k, 'hour')
-    .add(duration.minutes() * k, 'minute')
-    .add(duration.seconds() * k, 'second')
-    .add(duration.milliseconds() * k, 'millisecond')
+  date.add(duration.years() * k, 'y')
+    .add(duration.months() * k, 'M')
+    .add(duration.days() * k, 'd')
+    .add(duration.hours() * k, 'h')
+    .add(duration.minutes() * k, 'm')
+    .add(duration.seconds() * k, 's')
+    .add(duration.milliseconds() * k, 'ms')
 
 export default (option, Dayjs, dayjs) => {
   $d = dayjs

test/plugin/duration.test.js

@@ -182,12 +182,10 @@ test('Add duration', () => {
   const a = dayjs('2020-10-01')
   const days = dayjs.duration(2, 'days')
   expect(a.add(days).format('YYYY-MM-DD')).toBe('2020-10-03')
-})
 
-test('Add duration month', () => {
-  const a = dayjs('2023-02-01')
-  const days = dayjs.duration(1, 'month')
-  expect(a.add(days).format('YYYY-MM-DD')).toBe('2023-03-01')
+  const b = dayjs('2023-02-01 00:00:00')
+  const p = dayjs.duration('P1Y1M1DT1H1M1S')
+  expect(b.add(p).format('YYYY-MM-DD HH:mm:ss')).toBe('2024-03-02 01:01:01')
 })
 
 describe('Subtract', () => {
@@ -200,12 +198,10 @@ test('Subtract duration', () => {
   const a = dayjs('2020-10-20')
   const days = dayjs.duration(2, 'days')
   expect(a.subtract(days).format('YYYY-MM-DD')).toBe('2020-10-18')
-})
 
-test('Subtract duration month', () => {
-  const a = dayjs('2023-03-01')
-  const days = dayjs.duration(1, 'month')
-  expect(a.subtract(days).format('YYYY-MM-DD')).toBe('2023-02-01')
+  const b = dayjs('2023-03-02 02:02:02')
+  const p = dayjs.duration('P1Y1M1DT1H1M1S')
+  expect(b.subtract(p).format('YYYY-MM-DD HH:mm:ss')).toBe('2022-02-01 01:01:01')
 })
 
 describe('Seconds', () => {