Seconds and minutes

[serviceform]

How can we accomplish:

2s ago
1m 22s ago
1h 2m 33s ago

[catamphetamine]

Hmm.
For that you could use just RelativeTimeFormat:

const days= interval / (24 * 60 * 60 * 1000)
const hours = (interval - days * 24 * 60 * 60 * 1000) / 60 * 60 * 1000
...
const formatter = new RelativeTimeFormat(('en', { style: 'narrow' })
formatter.format(days, 'days') + ' ' + formatter .format(hours, 'hours') + ...