What am I Missing?

[Kirika-]

Hum... OK, can you list the node(s) zone/location you were trying to track down?

As for Garland Tools, the timers are fairly accurate, maybe just off by 1~2m EzT (Eorzea Time) for the description times, but the Timer/Tracking bar is in your local real world time.

For example:





In this example, the node will spawn in game at 4am EzT.
If the Galand Tool progress bar is Green, then it is currently spawned and will last until the duration timer reaches 0:00, in image it is 2m 30s left in real world time before it poofs.
If the progress bar is Gray, then the node is in it's cool down phase and will spawn after the duration timer reaches 0:00.

The real world time shows your current real world time.
If progress bar is Green, the time is just your current time, whatever time zone you are in and assuming your PC/Console has it's time set to match your current time zone.
If progress bar is Gray, the time is when the next spawn will happen, in your real world time.

EzT doesn't equal real world time.
One real world minute = about 20 minutes EzT, so a "24 hour EzT day cycle" is 1 hour 10 minutes real world time.
In the case of this specific node, it spawns in game at 4:00AM EzT, lasts about 2 hours EzT, then poofs.
This translates in real world time too it spawns every 1 hour 10 minutes and last about 6 minutes, then poofs.

Basically, Garland Tools does the work of calculating the snyc between EzT and real world time, so it displays per your local real world time when something spawns and for how long in game.