diff --git a/host/host.go b/host/host.go
index 523b634..241ceb2 100644
--- a/host/host.go
+++ b/host/host.go
@@ -9,6 +9,7 @@ import (
 type HostInfoStat struct {
 	Hostname             string `json:"hostname"`
 	Uptime               uint64 `json:"uptime"`
+	BootTime             uint64 `json:"boot_time"`
 	Procs                uint64 `json:"procs"`           // number of processes
 	OS                   string `json:"os"`              // ex: freebsd, linux
 	Platform             string `json:"platform"`        // ex: ubuntu, linuxmint
diff --git a/host/host_darwin.go b/host/host_darwin.go
index 2a3a02d..069c6fa 100644
--- a/host/host_darwin.go
+++ b/host/host_darwin.go
@@ -11,6 +11,7 @@ import (
 	"runtime"
 	"strconv"
 	"strings"
+	"time"
 	"unsafe"
 
 	"github.com/shirou/gopsutil/internal/common"
@@ -39,14 +40,10 @@ func HostInfo() (*HostInfoStat, error) {
 		ret.VirtualizationRole = role
 	}
 
-	values, err := common.DoSysctrl("kern.boottime")
+	boot, err := BootTime()
 	if err == nil {
-		// ex: { sec = 1392261637, usec = 627534 } Thu Feb 13 12:20:37 2014
-		v := strings.Replace(values[2], ",", "", 1)
-		t, err := strconv.ParseUint(v, 10, 64)
-		if err != nil {
-			ret.Uptime = t
-		}
+		ret.BootTime = boot
+		ret.Uptime = uptime(boot)
 	}
 
 	return ret, nil
@@ -59,7 +56,6 @@ func BootTime() (uint64, error) {
 	}
 	// ex: { sec = 1392261637, usec = 627534 } Thu Feb 13 12:20:37 2014
 	v := strings.Replace(values[2], ",", "", 1)
-
 	boottime, err := strconv.ParseInt(v, 10, 64)
 	if err != nil {
 		return 0, err
@@ -68,6 +64,18 @@ func BootTime() (uint64, error) {
 	return uint64(boottime), nil
 }
 
+func uptime(boot uint64) uint64 {
+	return uint64(time.Now().Unix()) - boot
+}
+
+func Uptime() (uint64, error) {
+	boot, err := BootTime()
+	if err != nil {
+		return 0, err
+	}
+	return uptime(boot), nil
+}
+
 func Users() ([]UserStat, error) {
 	utmpfile := "/var/run/utmpx"
 	var ret []UserStat
diff --git a/host/host_freebsd.go b/host/host_freebsd.go
index 95a7154..69e2197 100644
--- a/host/host_freebsd.go
+++ b/host/host_freebsd.go
@@ -11,6 +11,7 @@ import (
 	"runtime"
 	"strconv"
 	"strings"
+	"time"
 	"unsafe"
 
 	"github.com/shirou/gopsutil/internal/common"
@@ -45,14 +46,10 @@ func HostInfo() (*HostInfoStat, error) {
 		ret.VirtualizationRole = role
 	}
 
-	values, err := common.DoSysctrl("kern.boottime")
+	boot, err := BootTime()
 	if err == nil {
-		// ex: { sec = 1392261637, usec = 627534 } Thu Feb 13 12:20:37 2014
-		v := strings.Replace(values[2], ",", "", 1)
-		t, err := strconv.ParseUint(v, 10, 64)
-		if err == nil {
-			ret.Uptime = t
-		}
+		ret.BootTime = boot
+		ret.Uptime = uptime(boot)
 	}
 
 	return ret, nil
@@ -74,6 +71,18 @@ func BootTime() (int64, error) {
 	return boottime, nil
 }
 
+func uptime(boot uint64) uint64 {
+	return uint64(time.Now().Unix()) - boot
+}
+
+func Uptime() (uint64, error) {
+	boot, err := BootTime()
+	if err != nil {
+		return 0, err
+	}
+	return uptime(boot), nil
+}
+
 func Users() ([]UserStat, error) {
 	utmpfile := "/var/run/utx.active"
 	if !common.PathExists(utmpfile) {
diff --git a/host/host_linux.go b/host/host_linux.go
index 0ac9ea8..91b1530 100644
--- a/host/host_linux.go
+++ b/host/host_linux.go
@@ -13,6 +13,7 @@ import (
 	"runtime"
 	"strconv"
 	"strings"
+	"time"
 	"unsafe"
 
 	"github.com/shirou/gopsutil/internal/common"
@@ -46,9 +47,10 @@ func HostInfo() (*HostInfoStat, error) {
 		ret.VirtualizationSystem = system
 		ret.VirtualizationRole = role
 	}
-	uptime, err := BootTime()
+	boot, err := BootTime()
 	if err == nil {
-		ret.Uptime = uptime
+		ret.BootTime = boot
+		ret.Uptime = uptime(boot)
 	}
 
 	return ret, nil
@@ -78,6 +80,18 @@ func BootTime() (uint64, error) {
 	return 0, fmt.Errorf("could not find btime")
 }
 
+func uptime(boot uint64) uint64 {
+	return uint64(time.Now().Unix()) - boot
+}
+
+func Uptime() (uint64, error) {
+	boot, err := BootTime()
+	if err != nil {
+		return 0, err
+	}
+	return uptime(boot), nil
+}
+
 func Users() ([]UserStat, error) {
 	utmpfile := "/var/run/utmp"
 
diff --git a/host/host_windows.go b/host/host_windows.go
index 51f2d60..13890bf 100644
--- a/host/host_windows.go
+++ b/host/host_windows.go
@@ -47,9 +47,10 @@ func HostInfo() (*HostInfoStat, error) {
 		return ret, err
 	}
 
-	ret.Uptime, err = BootTime()
-	if err != nil {
-		return ret, err
+	boot, err := BootTime()
+	if err == nil {
+		ret.BootTime = boot
+		ret.Uptime = uptime(boot)
 	}
 
 	procs, err := process.Pids()
@@ -87,6 +88,18 @@ func BootTime() (uint64, error) {
 	return uint64(now.Sub(t).Seconds()), nil
 }
 
+func uptime(boot uint64) uint64 {
+	return uint64(time.Now().Unix()) - boot
+}
+
+func Uptime() (uint64, error) {
+	boot, err := BootTime()
+	if err != nil {
+		return 0, err
+	}
+	return uptime(boot), nil
+}
+
 func GetPlatformInformation() (platform string, family string, version string, err error) {
 	if osInfo == nil {
 		_, err = GetOSInfo()