diff --git a/spreadsheet/formula/fndatetime.go b/spreadsheet/formula/fndatetime.go
index 80635b11..34b47b87 100644
--- a/spreadsheet/formula/fndatetime.go
+++ b/spreadsheet/formula/fndatetime.go
@@ -8,6 +8,8 @@
 package formula
 
 import (
+	"fmt"
+	"github.com/davecgh/go-spew/spew"
 	"regexp"
 	"strconv"
 	"strings"
@@ -205,7 +207,7 @@ const nsPerDay = 86400000000000
 
 func dateFromDays(days float64) time.Time {
 	unix := int64((days - daysTo1970) * nsPerDay)
-	return time.Unix(0, unix)
+	return time.Unix(0, unix).UTC()
 }
 
 func daysFromDate(y, m, d int) float64 {
@@ -786,17 +788,26 @@ func YearFrac(args []Result) Result {
 	if args[1].Type != ResultTypeNumber {
 		return MakeErrorResult("YEARFRAC requires end date to be number argument")
 	}
+	spew.Dump(args)
+	spew.Dump(startDate)
 	endDate := args[1].ValueNumber
+	spew.Dump(endDate)
+	spew.Dump(basis)
 	yf, errResult := yearFrac(startDate, endDate, basis)
 	if errResult.Type == ResultTypeError {
 		return errResult
 	}
+	spew.Dump(yf)
 	return MakeNumberResult(yf)
 }
 
-// yearFrac returns float64 fraction of the year and Result value which can be of ResultTypeError type if an error occurs or ResultTypeEmpty if doesn't.
+// yearFrac returns float64 fraction of the year and Result value which can be of
+// ResultTypeError type if an error occurs or ResultTypeEmpty if doesn't.
 func yearFrac(startDateF, endDateF float64, basis int) (float64, Result) {
 	startDate, endDate := dateFromDays(startDateF), dateFromDays(endDateF)
+	fmt.Printf("yearFRac\n")
+	spew.Dump(startDate)
+	spew.Dump(endDate)
 	startDateS := startDate.Unix()
 	endDateS := endDate.Unix()
 	if startDateS == endDateS {
diff --git a/spreadsheet/formula/functions_test.go b/spreadsheet/formula/functions_test.go
index f2776858..d7602432 100644
--- a/spreadsheet/formula/functions_test.go
+++ b/spreadsheet/formula/functions_test.go
@@ -1136,14 +1136,14 @@ func TestYearFrac(t *testing.T) {
 	ss := spreadsheet.New()
 	sheet := ss.AddSheet()
 
-	sheet.Cell("A1").SetTime(time.Date(1900, time.January, 1, 0, 0, 0, 0, time.UTC))
-	sheet.Cell("A2").SetTime(time.Date(1900, time.January, 2, 0, 0, 0, 0, time.UTC))
-	sheet.Cell("A3").SetTime(time.Date(1900, time.January, 31, 0, 0, 0, 0, time.UTC))
-	sheet.Cell("A4").SetTime(time.Date(1900, time.March, 31, 0, 0, 0, 0, time.UTC))
-	sheet.Cell("A5").SetTime(time.Date(1900, time.February, 1, 0, 0, 0, 0, time.UTC))
-	sheet.Cell("A6").SetTime(time.Date(1904, time.January, 1, 0, 0, 0, 0, time.UTC))
-	sheet.Cell("A7").SetTime(time.Date(1904, time.January, 2, 0, 0, 0, 0, time.UTC))
-	sheet.Cell("A8").SetTime(time.Date(1905, time.January, 1, 0, 0, 0, 0, time.UTC))
+	sheet.Cell("A1").SetTime(time.Date(1900, time.January, 1, 0, 0, 0, 0, time.Local))
+	sheet.Cell("A2").SetTime(time.Date(1900, time.January, 2, 0, 0, 0, 0, time.Local))
+	sheet.Cell("A3").SetTime(time.Date(1900, time.January, 31, 0, 0, 0, 0, time.Local))
+	sheet.Cell("A4").SetTime(time.Date(1900, time.March, 31, 0, 0, 0, 0, time.Local))
+	sheet.Cell("A5").SetTime(time.Date(1900, time.February, 1, 0, 0, 0, 0, time.Local))
+	sheet.Cell("A6").SetTime(time.Date(1904, time.January, 1, 0, 0, 0, 0, time.Local))
+	sheet.Cell("A7").SetTime(time.Date(1904, time.January, 2, 0, 0, 0, 0, time.Local))
+	sheet.Cell("A8").SetTime(time.Date(1905, time.January, 1, 0, 0, 0, 0, time.Local))
 	sheet.Cell("A9").SetString("Hello")
 	sheet.Cell("A10").SetString("World")