fix: Set + Get accept 'D' as the short version of 'date' (#795)

Author: iamkun

src/utils.js

@@ -32,6 +32,7 @@ const prettyUnit = (u) => {
     y: C.Y,
     w: C.W,
     d: C.D,
+    D: C.DATE,
     h: C.H,
     m: C.MIN,
     s: C.S,

test/utils.test.js

@@ -8,9 +8,17 @@ it('PrettyUnit', () => {
   expect(prettyUnit('Days')).toBe('day')
   expect(prettyUnit('days')).toBe('day')
   expect(prettyUnit('day')).toBe('day')
-  expect(prettyUnit('Q')).toBe('quarter')
   expect(prettyUnit('quarter')).toBe('quarter')
   expect(prettyUnit('quarters')).toBe('quarter')
+  expect(prettyUnit('D')).toBe('date')
+  expect(prettyUnit('d')).toBe('day')
+  expect(prettyUnit('M')).toBe('month')
+  expect(prettyUnit('y')).toBe('year')
+  expect(prettyUnit('h')).toBe('hour')
+  expect(prettyUnit('m')).toBe('minute')
+  expect(prettyUnit('s')).toBe('second')
+  expect(prettyUnit('ms')).toBe('millisecond')
+  expect(prettyUnit('Q')).toBe('quarter')
   expect(prettyUnit()).toBe('')
 })