date in rrd file

[vlpoliakov28]

hi!
By a call of the function Update value date in field last_update in rrd file the current datetime value setting.
why?

[ziutek]

I'm sorry, I don't understand your question.

[vlpoliakov28]

Hi!
When used function Update, what date wrote in rrd file? In field last_update.
How write in field last_update my own date?

[ziutek]

The Update method takes a time as its first parameter. See the code bellow:

u := NewUpdater(dbfile)
for i := 0; i < 10; i++ {
	time.Sleep(step * time.Second)
	err := u.Update(time.Now(), i, 1.5*float64(i))
	if err != nil {
		t.Fatal(err)
	}
}

You can replace time.Now() with arbitrary date but be careful because RRD library checks it against the previous data/timestamp written and can drop data with inconsistent timestamp.

[vlpoliakov28]

Big thanks! I will try it!