Initial

resources/app/common/primitives/date.mjs

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+/**
+ * Test whether a Date instance is valid.
+ * A valid date returns a number for its timestamp, and NaN otherwise.
+ * NaN is never equal to itself.
+ * @returns {boolean}
+ */
+export function isValid() {
+  return this.getTime() === this.getTime();
+}
+
+/**
+ * Return a standard YYYY-MM-DD string for the Date instance.
+ * @returns {string}    The date in YYYY-MM-DD format
+ */
+export function toDateInputString() {
+  const yyyy = this.getFullYear();
+  const mm = (this.getMonth() + 1).paddedString(2);
+  const dd = this.getDate().paddedString(2);
+  return `${yyyy}-${mm}-${dd}`;
+}
+
+/**
+ * Return a standard H:M:S.Z string for the Date instance.
+ * @returns {string}    The time in H:M:S format
+ */
+export function toTimeInputString() {
+  return this.toTimeString().split(" ")[0];
+}
+
+// Define primitives on the Date prototype
+Object.defineProperties(Date.prototype, {
+  isValid: {value: isValid},
+  toDateInputString: {value: toDateInputString},
+  toTimeInputString: {value: toTimeInputString}
+});