Fixed validation of fictionalDate input in create/edit chapter modals.

marko/page/story-content/components/create-chapter-modal/component.js

@@ -53,8 +53,12 @@ module.exports = class {
     
     let fictionalDate = new Date(values.fictionalDate + " UTC")
     if (values.fictionalDate != "") {
-      if (Number.isNaN(fictionalDate)) {
-        this.state.error = `Could not parse ${values.fictionalDate} as date!`
+      if (Number.isNaN(fictionalDate.getTime())) {
+        this.state.error = `Could not parse ${values.fictionalDate} as date.`
+        if (values.fictionalDate.includes("th")) {
+          this.state.error += " Try to remove the 'th'."
+        }
+
         return
       }
     } else {

marko/page/story-content/components/edit-chapter-modal/component.js

@@ -49,8 +49,12 @@ module.exports = class {
     
     let fictionalDate = new Date(values.fictionalDate + " UTC")
     if (values.fictionalDate != "") {
-      if (Number.isNaN(fictionalDate)) {
-        this.state.error = `Could not parse ${values.fictionalDate} as date`
+      if (Number.isNaN(fictionalDate.getTime())) {
+        this.state.error = `Could not parse ${values.fictionalDate} as date.`
+        if (values.fictionalDate.includes("th")) {
+          this.state.error += " Try to remove the 'th'."
+        }
+
         return
       }
     } else {