ObjectMapper default timezone is GMT, should be UTC

ObjectMapper is configured with GMT timezone:

protected final static BaseSettings DEFAULT_BASE = new BaseSettings(
            null, // can not share global ClassIntrospector any more (2.5+)
            DEFAULT_ANNOTATION_INTROSPECTOR,
            STD_VISIBILITY_CHECKER, null, TypeFactory.defaultInstance(),
            null, StdDateFormat.instance, null,
            Locale.getDefault(),
//            TimeZone.getDefault()
            TimeZone.getTimeZone("GMT"),  // <= HERE
            Base64Variants.getDefaultVariant() // 2.1
    );

(it’s on line 280)

But on many places in documentation and even in javadoc it’s written that it’s configured with UTC timezone. It is even cleaner to use UTC.

[cowtowncoder]

@cemo thank you for asking a good question: sometimes there are no good reasons, or reasons seem less convincing than what I thought.

[cemo]

Thanks for great explanation.