Challenge #5: ⏱️ The countdown to take off

Elves have a secret timestamp: it’s the exact date and time when Santa Claus takes off with the sleigh 🛷 to deliver gifts around the world. But at the North Pole they use a super weird format to store the time: YYYY*MM*DD@HH|mm|ss NP (example: 2025*12*25@00|00|00 NP).

Your mission is to write a function that receives:

• fromTime → reference date in elf format (YYYY*MM*DD@HH|mm|ss NP).
• takeOffTime → the same takeoff date, also in elf format.

The function must return:

• The full seconds remaining until takeoff.
• If we’re exactly at takeoff time → 0.
• If takeoff already happened → a negative number indicating how many seconds have passed since then.

🎯 Rules

• First convert the elf format to a timestamp. The NP suffix indicates official North Pole time (no time zones or DST), so you can treat it as if it were UTC.
• Use differences in seconds, not milliseconds.
• Always round down (floor): only full seconds.

🧩 Examples

const takeoff = '2025*12*25@00|00|00 NP'

// from December 24, 2025, 23:59:30, 30 seconds before takeoff
timeUntilTakeOff('2025*12*24@23|59|30 NP', takeoff)
// 30

// exactly at takeoff time
timeUntilTakeOff('2025*12*25@00|00|00 NP', takeoff)
// 0

// 12 seconds after takeoff
timeUntilTakeOff('2025*12*25@00|00|12 NP', takeoff)
// -12