数値(number)、文字列(string)、ブール値(boolean)、null、undefinedの5つの判定を行うときはtypeof ~ Date、配列などはオブジェクトとして扱われる。 Dateを判定したいときは、 ...

In theory, handling dates as a developer is as simple as creating, storing, and, if necessary, manipulating dates. But as a JavaScript developer, you would know this theory doesn’t hold long after you ...

js-joda has a lightweight footprint, only 43 kB minified and compressed, no third party dependencies. js-joda is fast. It is about 2 to 10 times faster than other JavaScript date libraries. js-joda ...