import * as time from "@xmpp/time";

time.date(); // '2016-11-18'
time.time(); // '20:45:30.221Z'
time.datetime(); // '2016-11-18T20:45:53.513Z'
time.offset(); // '-1:00'

// each method accepts an optional date or string argument

time.datetime("05 October 2011 14:48 UTC"); // '2011-10-05T14:48:00.000Z'
time.datetime(new Date("05 October 2011 14:48 UTC")); // '2011-10-05T14:48:00.000Z'

References

XEP-0082: XMPP Date and Time Profiles
XEP-0202: Entity Time
XEP-0203: Delayed Delivery