The addSeconds method returns a new DayPilot.Date value with the specified number of seconds added.
DayPilot.Date.addSeconds(seconds)seconds (number) - number of seconds to add.
The current value is not changed. The method returns a new DayPilot.Date object.
const start = new DayPilot.Date("2025-03-01T08:00:00");
const result = start.addSeconds(30);