Let us consider following example
const date = new Date(0);
date.setSeconds(60*60*24-1);
console.log(date.toISOString().substr(11, 8));
outputs
23:59:59
I am searching for elegant way to have
const date = new Date(0);
date.setSeconds(60*60*24+1);
console.log(date.toISOString().substr(11, 8));
output
24:00:01
instead of
00:00:01
by elegant I mean without implementing my own Date object... Maybe it would be possible to set a custom length of the day? Increase from 24h to 99h?
You can set the hour cycle in the hour cycle option (hr) and the language parameter available in the Intl.DateTimeFormat constructor and toLocaleTimeString, e.g.
console.log(
new Date(2020,7,1,0,5).toLocaleTimeString('en-CA-u-hc-h24')
);Whether the hour cycle setting "works" or not seems to depend on the language chosen and how it's set, so maybe not that reliable. Test thoroughly in different implementations.