refactored for maintainability

internal/validation/timefield.go

@@ -0,0 +1,50 @@
+package validation
+
+import (
+	"fmt"
+	"time"
+
+	"git.haelnorr.com/h/timefmt"
+)
+
+type TimeField struct {
+	Field
+	Value time.Time
+}
+
+func newTimeField(key string, format *timefmt.Format, g Getter) *TimeField {
+	raw := g.Get(key)
+	var startDate time.Time
+	if raw != "" {
+		var err error
+		startDate, err = format.Parse(raw)
+		if err != nil {
+			g.AddCheck(newFailedCheck(
+				"Invalid date/time format",
+				fmt.Sprintf("%s should be in format %s", key, format.LDML()),
+			))
+		}
+	}
+	return &TimeField{
+		Value: startDate,
+		Field: newField(key, g),
+	}
+}
+
+func (t *TimeField) Required() *TimeField {
+	if t.Value.IsZero() {
+		t.getter.AddCheck(newFailedCheck(
+			"Date/Time not provided",
+			fmt.Sprintf("%s must be provided", t.Key),
+		))
+	}
+	return t
+}
+
+// Optional will skip all validations if value is empty
+func (t *TimeField) Optional() *TimeField {
+	if t.Value.IsZero() {
+		t.optional = true
+	}
+	return t
+}