Subtracting time.Duration from time.Time in Go: how to do it correctly?

Hello, colleagues! I just started learning Go and encountered a problem when working with dates and time. I need to subtract, for example, 24 hours from the current moment to get the time "yesterday at the same time". I'm writing something like: ```go package main import ( "fmt" "time" ) func main() { now := time.Now() yesterday := now - 24 * time.Hour // Error! fmt.Println(yesterday) } ``` But the compiler gives an error: `invalid operation: operator - not defined on time.Time`. I understand that `time.Time` is a structure, not a number, and you cannot directly subtract from it. I tried using `time.Duration`, but got confused. The documentation says that `time.Time` can be added to `time.Duration`, but how do you subtract correctly? I need to get an exact value to later compare with another...