add utils

utils/dateTimeUtils.js

@@ -0,0 +1,31 @@
+/**
+ * refer: https://www.npmjs.com/package/solarlunar
+ */
+const solarLunar = require('solarlunar');
+
+
+// 获取 今日 到 阳历指定日期 的间隔
+function getSpanDays_solar(solarYear, solarMonth, solarDay) {
+    let nowDate_00_00 = new Date(new Date().toLocaleDateString()); /* 当日0点 */
+
+    let festivalDayDate = new Date(`${solarYear}-${solarMonth}-${solarDay} 00:00:00`);
+    let festivalSpanDays = ((festivalDayDate - nowDate_00_00) / (24 * 3600 * 1000));
+    // console.log(festivalSpanDays, nowDate_00_00, festivalDayDate);
+    return festivalSpanDays;
+}
+
+// 获取 今日 到 农历指定日期 的间隔
+function getSpanDays_lunar(lunarYear, lunarMonth, lunarDay) {
+    let nowDate_00_00 = new Date(new Date().toLocaleDateString()); /* 当日0点 */
+
+    let festivalDay = solarLunar.lunar2solar(lunarYear, lunarMonth, lunarDay); // 农历
+    let festivalDayDate = new Date(`${festivalDay.cYear}-${festivalDay.cMonth}-${festivalDay.cDay} 00:00:00`); // 2022-09-09T16:00:00.000Z
+    let festivalSpanDays = ((festivalDayDate - nowDate_00_00) / (24 * 3600 * 1000));
+    // console.log(festivalSpanDays, nowDate_00_00, festivalDayDate);
+    return festivalSpanDays;
+}
+
+module.exports = {
+    getSpanDays_solar,
+    getSpanDays_lunar
+}