first set date 2021-04-01, and set date 2021-05-31, display 2021-05-01 bug

.babelrc

@@ -2,8 +2,5 @@
 	"presets": [
 		"@babel/preset-react",
 		"@babel/preset-env"
-	],
-	"plugins": [
-		"@babel/plugin-proposal-class-properties"
 	]
 }

.travis.yml

@@ -3,7 +3,7 @@ sudo: false
 os:
   - linux
 node_js:
-  - '8'
+  - '12'
   - 'stable'
 script:
   - npm run lint

package.json

@@ -41,32 +41,29 @@
     "react": "^16.5.0"
   },
   "devDependencies": {
-    "@babel/core": "7.7.4",
-    "@babel/plugin-proposal-class-properties": "^7.7.4",
-    "@babel/preset-env": "^7.7.7",
-    "@babel/preset-react": "^7.7.4",
-    "@svgr/webpack": "4.3.3",
-    "@testing-library/jest-dom": "^4.2.4",
-    "@testing-library/react": "^9.3.2",
-    "@testing-library/user-event": "^7.1.2",
-    "@types/react": "^16.5.0",
+    "@babel/core": "^7.14.3",
+    "@babel/preset-env": "^7.14.2",
+    "@babel/preset-react": "^7.13.13",
+    "@testing-library/jest-dom": "^5.11.6",
+    "@testing-library/react": "^11.2.2",
+    "@testing-library/user-event": "^12.6.0",
+    "@types/react": "^16.14.2",
     "@typescript-eslint/eslint-plugin": "^2.8.0",
     "@typescript-eslint/parser": "^2.8.0",
     "babel-eslint": "10.0.3",
-    "babel-jest": "^24.9.0",
-    "babel-loader": "8.0.6",
     "babel-plugin-named-asset-import": "^0.3.5",
+    "babel-loader": "8.2.2",
     "camelcase": "^5.3.1",
     "case-sensitive-paths-webpack-plugin": "2.2.0",
     "css-loader": "3.2.0",
     "dotenv": "8.2.0",
     "dotenv-expand": "5.1.0",
-    "enzyme": "^3.0.0",
-    "enzyme-adapter-react-16": "^1.15.2",
     "eslint": "^6.6.0",
     "eslint-config-react-app": "^5.1.0",
     "eslint-loader": "3.0.2",
     "eslint-plugin-flowtype": "3.13.0",
+    "enzyme": "^3.11.0",
+    "enzyme-adapter-react-16": "^1.15.5",
     "eslint-plugin-import": "2.18.2",
     "eslint-plugin-jsx-a11y": "6.2.3",
     "eslint-plugin-react": "7.16.0",
@@ -75,11 +72,8 @@
     "fs-extra": "^8.1.0",
     "html-webpack-plugin": "4.0.0-beta.5",
     "identity-obj-proxy": "3.0.0",
-    "jest": "24.9.0",
-    "jest-environment-jsdom-fourteen": "0.1.0",
-    "jest-resolve": "24.9.0",
-    "jest-watch-typeahead": "0.4.2",
-    "jsdom": "^7.0.2",
+    "jest": "^26.6.3",
+    "jest-watch-typeahead": "0.6.1",
     "mini-css-extract-plugin": "0.8.0",
     "moment": "^2.16.0",
     "moment-timezone": "^0.5.13",
@@ -91,14 +85,14 @@
     "postcss-preset-env": "6.7.0",
     "postcss-safe-parser": "4.0.1",
     "pre-commit": "^1.1.3",
-    "react": "^16.5.0",
     "react-app-polyfill": "^1.0.5",
     "react-dev-utils": "10.1.0",
-    "react-dom": "^16.5.0",
+    "react": "^16.14.0",
+    "react-dom": "^16.14.0",
     "react-onclickoutside": "^6.9.0",
     "react-test-renderer": "^16.5.0",
     "resolve": "1.12.2",
-    "resolve-url-loader": "3.1.1",
+    "resolve-url-loader": "3.1.2",
     "sass-loader": "8.0.0",
     "semver": "6.3.0",
     "style-loader": "1.0.0",
@@ -138,7 +132,7 @@
       "<rootDir>/test/**/__tests__/**/*.{js,jsx,ts,tsx}",
       "<rootDir>/test/**/*.{spec,test}.{js,jsx,ts,tsx}"
     ],
-    "testEnvironment": "jest-environment-jsdom-fourteen",
+    "testEnvironment": "jsdom",
     "transform": {
       "^.+\\.(js|jsx|ts|tsx)$": "<rootDir>/node_modules/babel-jest",
       "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",

src/DateTime.js

@@ -338,17 +338,18 @@ export default class Datetime extends React.Component {
 		let updateOnView = this.getUpdateOn( this.getFormat('date') );
 		let viewDate = this.state.viewDate.clone();
 
-		// Set the value into day/month/year
-		viewDate[ this.viewToMethod[currentView] ](
-			parseInt( e.target.getAttribute('data-value'), 10 )
-		);
-
-		// Need to set month and year will for days view (prev/next month)
+		// Must first set month and year, then set day,
+		// need to set month and year will for days view (prev/next month)
 		if ( currentView === 'days' ) {
 			viewDate.month( parseInt( e.target.getAttribute('data-month'), 10 ) );
 			viewDate.year( parseInt( e.target.getAttribute('data-year'), 10 ) );
 		}
 
+		// Set the value into day/month/year
+		viewDate[ this.viewToMethod[currentView] ](
+			parseInt( e.target.getAttribute('data-value'), 10 )
+		);
+
 		let update = {viewDate: viewDate};
 		if ( currentView === updateOnView ) {
 			update.selectedDate = viewDate.clone();