package main
import (
"fmt"
"math"
"time"
)
func ToRelativePastTime(past time.Time) string {
now := time.Now().UTC()
delta := math.Abs(now.Sub(past).Seconds())
seconds := int(delta)
minutes := seconds / 60
hours := seconds / 3600
days := seconds / 86400
if seconds < 60 {
if seconds == 1 {
return "one second ago"
}
return fmt.Sprintf("%d seconds ago", seconds)
}
if seconds < 3600 {
if minutes == 1 {
return "a minute ago"
}
return fmt.Sprintf("%d minutes ago", minutes)
}
if seconds < 86400 {
if hours == 1 {
return "an hour ago"
}
return fmt.Sprintf("%d hours ago", hours)
}
if seconds < 2592000 { // 30 days
if days == 1 {
return "yesterday"
}
return fmt.Sprintf("%d days ago", days)
}
if seconds < 31104000 { // 12 months
months := days / 30
if months <= 1 {
return "a month ago"
}
return fmt.Sprintf("%d months ago", months)
}
years := days / 365
if years <= 1 {
return "a year ago"
}
return fmt.Sprintf("%d years ago", years)
}
func test(hoursAgo float64) {
secondsAgo := int(hoursAgo * 3600)
past := time.Now().UTC().Add(-time.Duration(secondsAgo) * time.Second)
fmt.Println(ToRelativePastTime(past))
}
func main() {
test(0.01) // 36 seconds ago
test(0.2) // 12 minutes ago
test(3) // 3 hours ago
test(25) // yesterday
test(360) // 15 days ago
test(1239) // a month ago
test(2239) // 3 months ago
test(8760) // a year ago
test(98763) // 11 years ago
}
/*
run:
36 seconds ago
12 minutes ago
3 hours ago
yesterday
15 days ago
a month ago
3 months ago
a year ago
11 years ago
*/
