diff --git a/os/gtime/gtime_time.go b/os/gtime/gtime_time.go
index e66967bc7..ed8254d36 100644
--- a/os/gtime/gtime_time.go
+++ b/os/gtime/gtime_time.go
@@ -147,82 +147,118 @@ func NewFromTimeStamp(timestamp int64) *Time {
 
 // Timestamp returns the timestamp in seconds.
 func (t *Time) Timestamp() int64 {
+	if t.IsZero() {
+		return 0
+	}
 	return t.UnixNano() / 1e9
 }
 
 // TimestampMilli returns the timestamp in milliseconds.
 func (t *Time) TimestampMilli() int64 {
+	if t.IsZero() {
+		return 0
+	}
 	return t.UnixNano() / 1e6
 }
 
 // TimestampMicro returns the timestamp in microseconds.
 func (t *Time) TimestampMicro() int64 {
+	if t.IsZero() {
+		return 0
+	}
 	return t.UnixNano() / 1e3
 }
 
 // TimestampNano returns the timestamp in nanoseconds.
 func (t *Time) TimestampNano() int64 {
+	if t.IsZero() {
+		return 0
+	}
 	return t.UnixNano()
 }
 
 // TimestampStr is a convenience method which retrieves and returns
 // the timestamp in seconds as string.
 func (t *Time) TimestampStr() string {
+	if t.IsZero() {
+		return ""
+	}
 	return strconv.FormatInt(t.Timestamp(), 10)
 }
 
 // TimestampMilliStr is a convenience method which retrieves and returns
 // the timestamp in milliseconds as string.
 func (t *Time) TimestampMilliStr() string {
+	if t.IsZero() {
+		return ""
+	}
 	return strconv.FormatInt(t.TimestampMilli(), 10)
 }
 
 // TimestampMicroStr is a convenience method which retrieves and returns
 // the timestamp in microseconds as string.
 func (t *Time) TimestampMicroStr() string {
+	if t.IsZero() {
+		return ""
+	}
 	return strconv.FormatInt(t.TimestampMicro(), 10)
 }
 
 // TimestampNanoStr is a convenience method which retrieves and returns
 // the timestamp in nanoseconds as string.
 func (t *Time) TimestampNanoStr() string {
+	if t.IsZero() {
+		return ""
+	}
 	return strconv.FormatInt(t.TimestampNano(), 10)
 }
 
 // Month returns the month of the year specified by t.
 func (t *Time) Month() int {
+	if t.IsZero() {
+		return 0
+	}
 	return int(t.Time.Month())
 }
 
 // Second returns the second offset within the minute specified by t,
 // in the range [0, 59].
 func (t *Time) Second() int {
+	if t.IsZero() {
+		return 0
+	}
 	return t.Time.Second()
 }
 
 // Millisecond returns the millisecond offset within the second specified by t,
 // in the range [0, 999].
 func (t *Time) Millisecond() int {
+	if t.IsZero() {
+		return 0
+	}
 	return t.Time.Nanosecond() / 1e6
 }
 
 // Microsecond returns the microsecond offset within the second specified by t,
 // in the range [0, 999999].
 func (t *Time) Microsecond() int {
+	if t.IsZero() {
+		return 0
+	}
 	return t.Time.Nanosecond() / 1e3
 }
 
 // Nanosecond returns the nanosecond offset within the second specified by t,
 // in the range [0, 999999999].
 func (t *Time) Nanosecond() int {
+	if t.IsZero() {
+		return 0
+	}
 	return t.Time.Nanosecond()
 }
 
 // String returns current time object as string.
 func (t *Time) String() string {
-	if t == nil {
-		return ""
-	}
 	if t.IsZero() {
 		return ""
 	}
diff --git a/os/gtime/gtime_z_unit_time_test.go b/os/gtime/gtime_z_unit_time_test.go
index 608c1a10c..05c90248b 100644
--- a/os/gtime/gtime_z_unit_time_test.go
+++ b/os/gtime/gtime_z_unit_time_test.go
@@ -71,6 +71,22 @@ func Test_New(t *testing.T) {
 		t.Assert(gtime.New(gtime.Time{}), nil)
 		t.Assert(gtime.New(&gtime.Time{}), nil)
 	})
+
+	// unconventional
+	gtest.C(t, func(t *gtest.T) {
+
+		var testUnconventionalDates = []string{
+			"2006-01.02",
+			"2006.01-02",
+		}
+
+		for _, item := range testUnconventionalDates {
+			timeTemp := gtime.New(item)
+			t.Assert(timeTemp.TimestampMilli(), 0)
+			t.Assert(timeTemp.TimestampMilliStr(), "")
+			t.Assert(timeTemp.String(), "")
+		}
+	})
 }
 
 func Test_Nil(t *testing.T) {