Actually, there's a better solution to that

eternicode · eternicode · commit c1b7aa272b47 · 2012-11-15T13:32:36.000-05:00
diff --git a/js/bootstrap-datepicker.js b/js/bootstrap-datepicker.js
@@ -768,9 +768,6 @@
 								});
 								val = $.inArray(filtered[0], dates[language].monthsShort) + 1;
 								break;
-							default:
-								val = 0;
-								break;
 						}
 					}
 					parsed[part] = val;

Original file line number	Diff line number	Diff line change
`@@ -768,9 +768,6 @@`
`768`	`768`	`});`
`769`	`769`	`val = $.inArray(filtered[0], dates[language].monthsShort) + 1;`
`770`	`770`	`break;`
`771`		`- default:`
`772`		`- val = 0;`
`773`		`- break;`
`774`	`771`	`}`
`775`	`772`	`}`
`776`	`773`	`parsed[part] = val;`