From 3573d1b78f2283a11f8062a896559fc516a3bb37 Mon Sep 17 00:00:00 2001
From: Kenichiro NOGI <systemadmin@next-hd.co.jp>
Date: Sat, 5 Sep 2026 14:29:08 +0900
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---
 .../src/lib/dateParser.js                     | 92 +++++++++++++++++++
 .../test/dateParser.test.js                   | 37 ++++++++
 2 files changed, 129 insertions(+)
 create mode 100644 NodeSrv/apps/healthcheck-survey-bot/src/lib/dateParser.js
 create mode 100644 NodeSrv/apps/healthcheck-survey-bot/test/dateParser.test.js

diff --git a/NodeSrv/apps/healthcheck-survey-bot/src/lib/dateParser.js b/NodeSrv/apps/healthcheck-survey-bot/src/lib/dateParser.js
new file mode 100644
index 00000000..8ca27bec
--- /dev/null
+++ b/NodeSrv/apps/healthcheck-survey-bot/src/lib/dateParser.js
@@ -0,0 +1,92 @@
+const ERA_INFO = {
+  "令和": 2018,
+  "平成": 1988,
+  "昭和": 1925,
+  "大正": 1911,
+};
+
+const ERA_ALIASES = { R: "令和", H: "平成", S: "昭和", T: "大正" };
+
+function pad2(value) {
+  return String(value).padStart(2, "0");
+}
+
+function finalizeDateParts(year, month, day) {
+  if (!Number.isFinite(year) || !Number.isFinite(month) || !Number.isFinite(day)) {
+    throw new Error("日付形式で回答してください（例: 2026-03-01）");
+  }
+  const date = new Date(year, month - 1, day);
+  if (date.getFullYear() !== year || date.getMonth() !== month - 1 || date.getDate() !== day) {
+    throw new Error("存在しない日付です");
+  }
+  return `${year}-${pad2(month)}-${pad2(day)}`;
+}
+
+function tryParseEraDate(compact) {
+  const match = compact.match(/^(令和|平成|昭和|大正|R|H|S|T)(.+)$/i);
+  if (!match) return null;
+
+  let era = match[1];
+  if (/^[RHST]$/i.test(era)) {
+    era = ERA_ALIASES[era.toUpperCase()] || era;
+  }
+  if (!ERA_INFO[era]) return null;
+
+  const normalized = match[2]
+    .replace(/年/g, "-")
+    .replace(/月/g, "-")
+    .replace(/日/g, "")
+    .replace(/[.\/]/g, "-");
+  const parts = normalized.split("-").filter((part) => part.length > 0);
+  if (parts.length < 3) {
+    throw new Error("月と日まで入力してください（例: 令和6年3月1日）");
+  }
+
+  const eraYear = Number(parts[0]);
+  const month = Number(parts[1]);
+  const day = Number(parts[2]);
+  if (!Number.isFinite(eraYear) || !Number.isFinite(month) || !Number.isFinite(day)) {
+    throw new Error("日付形式で回答してください（例: 令和6年3月1日）");
+  }
+
+  return finalizeDateParts(ERA_INFO[era] + eraYear, month, day);
+}
+
+function tryParseMonthDay(compact) {
+  const match = compact.match(/^(\d{1,2})(?:月|\/|-|\.)(\d{1,2})(?:日)?$/);
+  if (!match) return null;
+  const currentYear = new Date().getFullYear();
+  return finalizeDateParts(currentYear, Number(match[1]), Number(match[2]));
+}
+
+function parseDateInput(value) {
+  const trimmed = String(value ?? "").trim();
+  if (!trimmed) {
+    throw new Error("日付が空です");
+  }
+  const compact = trimmed.replace(/\s+/g, "");
+
+  const eraResult = tryParseEraDate(compact);
+  if (eraResult) return eraResult;
+
+  const monthDayResult = tryParseMonthDay(compact);
+  if (monthDayResult) return monthDayResult;
+
+  const normalized = compact
+    .replace(/年/g, "-")
+    .replace(/月/g, "-")
+    .replace(/日/g, "")
+    .replace(/[.\/]/g, "-");
+  const isoParts = normalized.split("-").filter((part) => part.length > 0);
+  if (isoParts.length === 3 && isoParts[0].length >= 4) {
+    return finalizeDateParts(Number(isoParts[0]), Number(isoParts[1]), Number(isoParts[2]));
+  }
+
+  const parsed = new Date(trimmed);
+  if (Number.isNaN(parsed.getTime())) {
+    throw new Error("日付形式で回答してください（例: 2026-03-01 や 令和6年3月1日）");
+  }
+  return finalizeDateParts(parsed.getFullYear(), parsed.getMonth() + 1, parsed.getDate());
+}
+
+module.exports = { parseDateInput };
diff --git a/NodeSrv/apps/healthcheck-survey-bot/test/dateParser.test.js b/NodeSrv/apps/healthcheck-survey-bot/test/dateParser.test.js
new file mode 100644
index 00000000..701004bc
--- /dev/null
+++ b/NodeSrv/apps/healthcheck-survey-bot/test/dateParser.test.js
@@ -0,0 +1,37 @@
+// test/dateParser.test.js
+const { test } = require("node:test");
+const assert = require("node:assert");
+const { parseDateInput } = require("../src/lib/dateParser");
+
+test("ISO形式の日付をそのまま解釈する", () => {
+  assert.strictEqual(parseDateInput("2026-03-01"), "2026-03-01");
+});
+
+test("スラッシュ区切りの日付を解釈する", () => {
+  assert.strictEqual(parseDateInput("2026/3/1"), "2026-03-01");
+});
+
+test("和暦(令和)を西暦に変換する", () => {
+  assert.strictEqual(parseDateInput("令和6年3月1日"), "2024-03-01");
+});
+
+test("和暦の略記(R)を西暦に変換する", () => {
+  assert.strictEqual(parseDateInput("R6.3.1"), "2024-03-01");
+});
+
+test("月日のみの入力は今年として解釈する", () => {
+  const currentYear = new Date().getFullYear();
+  assert.strictEqual(parseDateInput("3/1"), `${currentYear}-03-01`);
+});
+
+test("空文字はエラーになる", () => {
+  assert.throws(() => parseDateInput(""), /日付が空です/);
+});
+
+test("存在しない日付はエラーになる", () => {
+  assert.throws(() => parseDateInput("2026-02-30"), /存在しない日付です/);
+});
+
+test("解釈不能な文字列はエラーになる", () => {
+  assert.throws(() => parseDateInput("あいうえお"));
+});