diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..1e1fb3c
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,10 @@
+module zeroboo/serverutils
+
+go 1.17
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.8.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..b410979
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,14 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/serverutils.go b/serverutils.go
new file mode 100644
index 0000000..2ac6313
--- /dev/null
+++ b/serverutils.go
@@ -0,0 +1 @@
+package serverutils
diff --git a/timeutils/timeutils.go b/timeutils/timeutils.go
new file mode 100644
index 0000000..227a657
--- /dev/null
+++ b/timeutils/timeutils.go
@@ -0,0 +1,38 @@
+package timeutils
+
+import "time"
+
+func GetTimeBeginOfDay(t time.Time) time.Time {
+	year, month, day := t.Date()
+	return time.Date(year, month, day, 0, 0, 0, 0, t.Location())
+}
+
+func GetTimeBeginOfYesterday(t time.Time) time.Time {
+	year, month, day := t.Date()
+
+	return time.Date(year, month, day, 0, 0, 0, 0, t.Location()).Add(time.Hour * 24 * -1)
+}
+
+func GetSecondsSinceBeginOfDay(t time.Time) int64 {
+	bod := GetTimeBeginOfDay(t)
+	result := t.Sub(bod).Seconds()
+	return int64(result)
+}
+
+func GetTimeBeginOfNextDay(t time.Time) time.Time {
+	year, month, day := t.Date()
+	bod := time.Date(year, month, day, 0, 0, 0, 0, t.Location())
+	return bod.Add(time.Duration(24) * time.Hour)
+}
+
+func IsDifferentDay(t1 time.Time, t2 time.Time) bool {
+	day1 := time.Date(t1.Year(), t1.Month(), t1.Day(), 0, 0, 0, 0, t1.Location())
+	day2 := time.Date(t2.Year(), t2.Month(), t2.Day(), 0, 0, 0, 0, t2.Location())
+	return !day2.Equal(day1)
+}
+
+func CalculateDayPassed(from time.Time, to time.Time) int {
+	dayFrom := time.Date(from.Year(), from.Month(), from.Day(), 0, 0, 0, 0, from.Location())
+	dayTo := time.Date(to.Year(), to.Month(), to.Day(), 0, 0, 0, 0, to.Location())
+	return int(dayTo.Sub(dayFrom).Hours() / 24)
+}
diff --git a/timeutils_test.go b/timeutils_test.go
new file mode 100644
index 0000000..b22b7de
--- /dev/null
+++ b/timeutils_test.go
@@ -0,0 +1,51 @@
+package serverutils
+
+import (
+	"log"
+	"testing"
+	"time"
+	"zeroboo/serverutils/timeutils"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetTimeBeginOfDay_CurrentTime_CorrectValue(t *testing.T) {
+	log.Println("TestGetTimeBeginOfDay_CurrentTime_CorrectValue")
+	currentTime := time.Now()
+	bod := timeutils.GetTimeBeginOfDay(currentTime)
+	log.Printf("BeginOfDay of %v is %v", currentTime, bod)
+
+	assert.Equal(t, 0, bod.Hour(), "BOD: 0 hour")
+	assert.Equal(t, 0, bod.Minute(), "BOD: 0 minute")
+	assert.Equal(t, 0, bod.Second(), "BOD: 0 second")
+
+}
+
+const TestTimeLayout = "2006-01-02T15:04:05.000"
+
+func TestGetTimeBeginOfDay_PresetDate_CorrectValue(t *testing.T) {
+	log.Println("TestGetTimeBeginOfDay_CorrectValue")
+
+	testTime, errTestTime := time.Parse(TestTimeLayout, "1945-09-02T04:30:19.750")
+	bodTime, errBODTime := time.Parse(TestTimeLayout, "1945-09-02T00:00:00.000")
+	log.Printf("Prepare test done, errTestTime=%v, errBODTime=%v", errTestTime, errBODTime)
+	assert.Equal(t, nil, errTestTime, "No parsing error")
+	assert.Equal(t, nil, errBODTime, "No parsing error")
+
+	bod := timeutils.GetTimeBeginOfDay(testTime)
+	log.Printf("BeginOfDay of %v is %v", testTime, bodTime)
+
+	assert.Equal(t, bod, bodTime, "Expected bod")
+}
+
+func TestGetSecondsSinceBeginOfDay_PresetDate_CorrectValue(t *testing.T) {
+	log.Println("TestGetTimeBeginOfDay_CorrectValue")
+	log.Println("TestGetTimeBeginOfDay_CorrectValue")
+
+	testTime, errTestTime := time.Parse(TestTimeLayout, "1945-09-02T04:30:19.750")
+	log.Printf("Prepare test done, errTestTime=%v", errTestTime)
+	secondsSinceBOD := timeutils.GetSecondsSinceBeginOfDay(testTime)
+	log.Printf("Seconds since begin of day of `%v` is %v", testTime, secondsSinceBOD)
+
+	assert.Equal(t, int64(16219), secondsSinceBOD, "Expected seconds")
+}