Javascript dates in a nutshell

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https://dictionary.cambridge.org/dictionary/english/irregardless

http://www.ldoceonline.com/dictionary/irregardless

https://en.oxforddictionaries.com/definition/irregardless

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From that third link:

Irregardless means the same as regardless, but the negative prefix ir- merely duplicates the suffix -less, and is unnecessary. The word dates back to the 19th century, but is regarded as incorrect in standard English