date-format
Formatting Date objects as strings since 2013
is-date-object
Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
clone-deep
Recursively (deep) clone JavaScript native types, like Object, Array, RegExp, Date as well as primitives.
kind-of
Get the native type of a value.
is-extendable
Returns true if a value is a plain object, array or function.