diff --git a/date.go b/date.go
index e75bdaa..49e7c9e 100644
--- a/date.go
+++ b/date.go
@@ -208,18 +208,6 @@ func (d date) IsNASDAQHoliday(t time.Time) bool {
 	return d.IsNYSEHoliday(t)
 }
 
-// Eastern returns the eastern timezone.
-func (d date) Eastern() *time.Location {
-	if _eastern == nil {
-		_easternLock.Lock()
-		defer _easternLock.Unlock()
-		if _eastern == nil {
-			_eastern, _ = time.LoadLocation("America/New_York")
-		}
-	}
-	return _eastern
-}
-
 // Time returns a new time.Time for the given clock components.
 func (d date) Time(hour, min, sec, nsec int, loc *time.Location) time.Time {
 	return time.Date(0, 0, 0, hour, min, sec, nsec, loc)
diff --git a/date_posix.go b/date_posix.go
new file mode 100644
index 0000000..2ab23fe
--- /dev/null
+++ b/date_posix.go
@@ -0,0 +1,17 @@
+// +build !windows
+
+package chart
+
+import "time"
+
+// Eastern returns the eastern timezone.
+func (d date) Eastern() *time.Location {
+	if _eastern == nil {
+		_easternLock.Lock()
+		defer _easternLock.Unlock()
+		if _eastern == nil {
+			_eastern, _ = time.LoadLocation("America/New_York")
+		}
+	}
+	return _eastern
+}
diff --git a/date_windows.go b/date_windows.go
new file mode 100644
index 0000000..7660a98
--- /dev/null
+++ b/date_windows.go
@@ -0,0 +1,17 @@
+// +build windows
+
+package chart
+
+import "time"
+
+// Eastern returns the eastern timezone.
+func (d date) Eastern() *time.Location {
+	if _eastern == nil {
+		_easternLock.Lock()
+		defer _easternLock.Unlock()
+		if _eastern == nil {
+			_eastern, _ = time.LoadLocation("Eastern Standard Time")
+		}
+	}
+	return _eastern
+}