Calculate number of days between two dates?

How can I calculate the number of days between two dates? In the code below I should get the number of hours, which means that I should only need to divide by 24. However, the result I get is something like -44929.000000. I'm only looking a day or two back so I would expect 24 or 48 hours.

package main

import (
	"fmt"
	"time"
)

func main() {
	timeFormat := "2006-01-02"

	t, _ := time.Parse(timeFormat, "2014-12-28")
	fmt.Println(t)
	//	duration := time.Since(t)
	duration := time.Now().Sub(t)
	fmt.Printf("%f", duration.Hours())
}

Here's the executable Go code: http://play.golang.org/p/1MV6wnLVKh

Your program seems to work as intended. I'm getting 45.55 hours. Have you tried to run it locally?

Playground time is fixed, time.Now() will give you 2009-11-10 23:00:00 +0000 UTC always.

package main

import (
	"fmt"
	"time"
)

func main() {

    date := time.Now()
	fmt.Println(date)

    format := "2006-01-02 15:04:05"
	then,_ := time.Parse(format, "2007-09-18 11:58:06")
	fmt.Println(then)

    diff := date.Sub(then)

    //func Since(t Time) Duration
    //Since returns the time elapsed since t. 
    //It is shorthand for time.Now().Sub(t).
	
	fmt.Println(diff.Hours())// number of Hours
	fmt.Println(diff.Nanoseconds())// number of Nanoseconds
	fmt.Println(diff.Minutes())// number of Minutes
	fmt.Println(diff.Seconds())// number of Seconds
	
	fmt.Println(int(diff.Hours()/24))// number of days    

}

Here is the running code https://play.golang.org/p/Vbhh1cBKnh

> the below code gives the list of all the days along with the number of days between the from date and to date:
you can click on the link for the code in
Go PlayGround:https://play.golang.org/p/MBThBpTqjdz

to := time.Now()
from := to.AddDate(0, -1, 0)
fmt.Println("toDate", to)
fmt.Println("fromDate", from)
days := to.Sub(from) / (24 * time.Hour)
fmt.Println("days", int(days))
noofdays := int(days)

for i := 0; i <= noofdays; i++ {
	fmt.Println(from.AddDate(0, 0, i))
}

One caveat to be mindful of when using this technique of timeOne.Sub(timeTwo).Hours() / 24 is that daylights savings can cause a day to contain only 23 hours, throwing this calculation off slightly.

Happy programmer's day

package main

import (
    "fmt"
    "time"
)    

func main() {
    loc, _ := time.LoadLocation("UTC")
    now  := time.Now().In(loc)
    firstDate := time.Date(now.Year(), 1, 1, 0, 0, 0, 0, loc)
    diff := now.Sub(firstDate)
    
    fmt.Printf("The difference between %s and today %s es %d days\n", now.String(), firstDate.String(),  int(diff.Hours()/24)+1)


    // Just a joke
    if ( int(diff.Hours()/24)+1 == 256 ) {
        fmt.Printf("¡Happy programmer's day!") 
    } else {
        fmt.Printf("On my computer it works...!?") 
    }
}