...
// FormattedLastSeen func
func (u *User) FormattedLastSeen() string {
    return u.LastSeen.Format("2006-01-02 15:04:05")
}
...

...
    <p>Last seen on: {{ .ProfileUser.FormattedLastSeen }}</p>
...

...
​
const (
    minute  = 1
    hour    = minute * 60
    day     = hour * 24
    month   = day * 30
    year    = day * 365
    quarter = year / 4
)
​
// FromDuration returns a friendly string representing an approximation of the
// given duration
func FromDuration(d time.Duration) string {
    seconds := round(d.Seconds())
​
    if seconds < 30 {
        return "less than a minute"
    }
​
    if seconds < 90 {
        return "1 minute"
    }
​
    minutes := div(seconds, 60)
​
    if minutes < 45 {
        return fmt.Sprintf("%0d minutes", minutes)
    }
​
    hours := div(minutes, 60)
​
    if minutes < day {
        return fmt.Sprintf("about %s", pluralize(hours, "hour"))
    }
​
    if minutes < (42 * hour) {
        return "1 day"
    }
​
    days := div(hours, 24)
​
    if minutes < (30 * day) {
        return pluralize(days, "day")
    }
​
    months := div(days, 30)
​
    if minutes < (45 * day) {
        return "about 1 month"
    }
​
    if minutes < (60 * day) {
        return "about 2 months"
    }
​
    if minutes < year {
        return pluralize(months, "month")
    }
​
    rem := minutes % year
    years := minutes / year
​
    if rem < (3 * month) {
        return fmt.Sprintf("about %s", pluralize(years, "year"))
    }
    if rem < (9 * month) {
        return fmt.Sprintf("over %s", pluralize(years, "year"))
    }
​
    years++
    return fmt.Sprintf("almost %s", pluralize(years, "year"))
}
​
// FromTime returns a friendly string representing the approximate difference
// from the given time and time.Now()
func FromTime(t time.Time) string {
    now := time.Now()
​
    var d time.Duration
    var suffix string
​
    if t.Before(now) {
        d = now.Sub(t)
        suffix = "ago"
    } else {
        d = t.Sub(now)
        suffix = "from now"
    }
​
    return fmt.Sprintf("%s %s", FromDuration(d), suffix)
}
​
func pluralize(i int, s string) string {
    var buf bytes.Buffer
    buf.WriteString(fmt.Sprintf("%d %s", i, s))
    if i != 1 {
        buf.WriteString("s")
    }
    return buf.String()
}
​
func round(f float64) int {
    return int(math.Floor(f + .50))
}
​
func div(numerator int, denominator int) int {
    rem := numerator % denominator
    result := numerator / denominator
​
    if rem >= (denominator / 2) {
        result++
    }
​
    return result
}

...
// FormattedTimeAgo func
func (p *Post) FormattedTimeAgo() string {
    return FromTime(*p.Timestamp)
}
...

...
    {{range .Posts}}
        <table class="table table-hover">
            <tr valign="top">
                <td width="36px"><img src="{{.User.Avatar}}&s=36"></td>
                <td><a href="/user/{{.User.Username}}">{{ .User.Username }}</a> said {{.FormattedTimeAgo}}:<br>{{ .Body }}</td>
            </tr>
        </table>
    {{end}}
...