Add pointer conversion utilities to transform int64 to time.Time (#1433)

Adds pointer conversion `SecondsTimeValue` and `MillisecondsTimeValue` utilities for int64 to time.Time.

Fix #1432

aws/convert_types.go

@@ -311,6 +311,24 @@ func TimeValue(v *time.Time) time.Time {
 	return time.Time{}
 }
 
+// SecondsTimeValue converts an int64 pointer to a time.Time value
+// representing seconds since Epoch or time.Time{} if the pointer is nil.
+func SecondsTimeValue(v *int64) time.Time {
+	if v != nil {
+		return time.Unix((*v / 1000), 0)
+	}
+	return time.Time{}
+}
+
+// MillisecondsTimeValue converts an int64 pointer to a time.Time value
+// representing milliseconds sinch Epoch or time.Time{} if the pointer is nil.
+func MillisecondsTimeValue(v *int64) time.Time {
+	if v != nil {
+		return time.Unix(0, (*v * 1000000))
+	}
+	return time.Time{}
+}
+
 // TimeUnixMilli returns a Unix timestamp in milliseconds from "January 1, 1970 UTC".
 // The result is undefined if the Unix time cannot be represented by an int64.
 // Which includes calling TimeUnixMilli on a zero Time is undefined.

aws/convert_types_test.go

@@ -435,3 +435,36 @@ func TestTimeMap(t *testing.T) {
 		assert.Equal(t, in, out2, "Unexpected value at idx %d", idx)
 	}
 }
+
+type TimeValueTestCase struct {
+	in        int64
+	outSecs   time.Time
+	outMillis time.Time
+}
+
+var testCasesTimeValue = []TimeValueTestCase{
+	{
+		in:        int64(1501558289000),
+		outSecs:   time.Unix(1501558289, 0),
+		outMillis: time.Unix(1501558289, 0),
+	},
+	{
+		in:        int64(1501558289001),
+		outSecs:   time.Unix(1501558289, 0),
+		outMillis: time.Unix(1501558289, 1*1000000),
+	},
+}
+
+func TestSecondsTimeValue(t *testing.T) {
+	for idx, testCase := range testCasesTimeValue {
+		out := SecondsTimeValue(&testCase.in)
+		assert.Equal(t, testCase.outSecs, out, "Unexpected value for time value at %d", idx)
+	}
+}
+
+func TestMillisecondsTimeValue(t *testing.T) {
+	for idx, testCase := range testCasesTimeValue {
+		out := MillisecondsTimeValue(&testCase.in)
+		assert.Equal(t, testCase.outMillis, out, "Unexpected value for time value at %d", idx)
+	}
+}