date-to-iso-8601-string

Presents a JavaScript `Date` as a string in [ISO 8601 format](https://www.loc.gov/standards/datetime/iso-tc154-wg5_n0038_iso_wd_8601-1_2016-02-16.pdf), with support for the Extended (`YYYY-MM-DD`) and Basic (`YYYYMMDD`) variants

@musement/iso-duration

JS's library created to provide easy API for working with time duration. Based on ISO 8601. Inspired by [HumanizeDuration](https://github.com/EvanHahn/HumanizeDuration.js) and [ISO8601-duration](https://github.com/tolu/ISO8601-duration).