fixed eslint

browser/main/Detail/SnippetNoteDetail.js

@@ -870,6 +870,7 @@ class SnippetNoteDetail extends React.Component {
               enableSmartPaste={config.editor.enableSmartPaste}
               hotkey={config.hotkey}
               autoDetect={autoDetect}
+              dateFormatISO8601={config.editor.dateFormatISO8601}
             />
           )}
         </div>

browser/main/lib/ConfigManager.js

@@ -100,6 +100,7 @@ export const DEFAULT_CONFIG = {
     enableSmartPaste: false,
     enableMarkdownLint: false,
     customMarkdownLintConfig: DEFAULT_MARKDOWN_LINT_CONFIG,
+    dateFormatISO8601: false,
     prettierConfig: `{
       "trailingComma": "es5",
       "tabWidth": 2,

browser/main/modals/PreferencesModal/UiTab.js

@@ -132,6 +132,7 @@ class UiTab extends React.Component {
         customMarkdownLintConfig: this.customMarkdownLintConfigCM
           .getCodeMirror()
           .getValue(),
+        dateFormatISO8601: this.refs.dateFormatISO8601.checked,
         prettierConfig: this.prettierConfigCM.getCodeMirror().getValue(),
         deleteUnusedAttachments: this.refs.deleteUnusedAttachments.checked,
         rtlEnabled: this.refs.rtlEnabled.checked
@@ -875,6 +876,19 @@ class UiTab extends React.Component {
             </label>
           </div>
 
+          <div styleName='group-checkBoxSection'>
+            <label>
+              <input
+                onChange={e => this.handleUIChange(e)}
+                checked={this.state.config.editor.dateFormatISO8601}
+                ref='dateFormatISO8601'
+                type='checkbox'
+              />
+              &nbsp;
+              {i18n.__('Date shortcut use iso 8601 format')}
+            </label>
+          </div>
+
           <div styleName='group-section'>
             <div styleName='group-section-label'>
               {i18n.__('Matching character pairs')}