feat: support convert milliseconds and fix timezone

README.md

@@ -176,6 +176,13 @@ utils.timestamp(); // 1378153226
 utils.timestamp(1385091596); // Fri Nov 22 2013 11:39:56 GMT+0800 (CST)
 // millseconds
 utils.timestamp(1385091596000); // Fri Nov 22 2013 11:39:56 GMT+0800 (CST)
+
+// Get Date from Milliseconds
+utils.getDateFromMilliseconds(1385091596000) // 2013-11-22
+utils.getDateFromMilliseconds(1385091596000, utility.DateFormat.DateTimeWithTimeZone) // 22/Nov/2013:01:46:36 +0000
+utils.getDateFromMilliseconds(1385091596000, utility.DateFormat.DateTimeWithMilliSeconds) // 2013-11-22 01:46:36.000
+utils.getDateFromMilliseconds(1385091596000, utility.DateFormat.DateTimeWithSeconds) // 2013-11-22 01:46:36
+utils.getDateFromMilliseconds(1385091596000, utility.DateFormat.UnixTimestamp) // 1385091596
 ```
 
 ### Number utils

package.json

@@ -13,7 +13,8 @@
   },
   "dependencies": {
     "escape-html": "^1.0.3",
-    "unescape": "^1.0.1"
+    "unescape": "^1.0.1",
+    "ylru": "^2.0.0"
   },
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.17.1",

src/date.ts

@@ -1,19 +1,17 @@
-// only set once.
-let TIMEZONE = '';
-export function resetTimezone() {
-  TIMEZONE = '';
-  let _hourOffset = Math.floor(-(new Date().getTimezoneOffset()) / 60);
-  if (_hourOffset >= 0) {
-    TIMEZONE += '+';
-  } else {
-    TIMEZONE += '-';
-  }
-  _hourOffset = Math.abs(_hourOffset);
-  const _hourOffsetStr = _hourOffset < 10 ? `0${_hourOffset}` : `${_hourOffset}`;
-  TIMEZONE += `${_hourOffsetStr}00`;
+import { LRU } from 'ylru';
+const lru = new LRU(1000); // Cache up to 1000 entries
+
+export function resetTimezone(date: Date) {
+  let TIMEZONE: string = '';
+  const offsetInMinutes = date.getTimezoneOffset();
+  const _hourOffset: number = Math.floor(-offsetInMinutes / 60);
+  const _minuteOffset: number = Math.abs(offsetInMinutes % 60);
+
+  TIMEZONE += _hourOffset >= 0 ? '+' : '-';
+  TIMEZONE += `${String(Math.abs(_hourOffset)).padStart(2, '0')}${String(_minuteOffset).padStart(2, '0')}`;
+
   return TIMEZONE;
 }
-resetTimezone();
 
 const MONTHS: Record<string, string> = {
   '01': 'Jan',
@@ -61,9 +59,19 @@ export function accessLogDate(d?: Date): string {
   // 16/Apr/2013:16:40:09 +0800
   d = d || new Date();
   const [ year, month, date, hours, minutes, seconds ] = getDateStringParts(d);
+  const TIMEZONE = getTimezone(d);
   return `${date}/${MONTHS[month]}/${year}:${hours}:${minutes}:${seconds} ${TIMEZONE}`;
 }
 
+export function getTimezone(d: Date) {
+  const key = d.getFullYear() + '-' + (d.getMonth() + 1) + '-' + d.getDate();
+  const timeZone = lru.get(key);
+  if (timeZone === undefined) {
+    lru.set(key, resetTimezone(d), { maxAge: 86400000 }); // Cache for 24 hours
+    return lru.get(key);
+  }
+  return timeZone;
+}
 /**
  * Normal log format date. format: `moment().format('YYYY-MM-DD HH:mm:ss.SSS')`
  */
@@ -186,3 +194,39 @@ export function timestamp(t?: number | string): number | Date {
 export function parseTimestamp(t: number | string): Date {
   return timestamp(t) as Date;
 }
+
+/**
+ * Convert Date object to Unix timestamp in seconds.
+ */
+export function dateToUnixTimestamp(date: Date): number {
+  return Math.round(date.getTime() / 1000);
+}
+
+export enum DateFormat {
+  DateTimeWithTimeZone,
+  DateTimeWithMilliSeconds,
+  DateTimeWithSeconds,
+  UnixTimestamp
+}
+
+/**
+ * Provide milliseconds, return a formatted string.
+ */
+export function getDateFromMilliseconds(milliseconds: number, format?: DateFormat): string {
+  if (!Number.isFinite(milliseconds)) {
+    throw new Error('Invalid milliseconds value');
+  }
+
+  switch (format) {
+    case DateFormat.DateTimeWithTimeZone:
+      return accessLogDate(new Date(milliseconds));
+    case DateFormat.DateTimeWithMilliSeconds:
+      return logDate(new Date(milliseconds));
+    case DateFormat.DateTimeWithSeconds:
+      return YYYYMMDDHHmmss(new Date(milliseconds));
+    case DateFormat.UnixTimestamp:
+      return dateToUnixTimestamp(new Date(milliseconds)).toString();
+    default:
+      return YYYYMMDD(new Date(milliseconds));
+  }
+}

test/date.test.ts

@@ -84,7 +84,7 @@ describe('test/date.test.ts', () => {
 
     it('should work with timestamp', () => {
       // timezone GMT+0800
-      assert.match(utils.YYYYMMDDHHmmss(1428894236645, {}), /^2015\-04\-13 (11|03):03:56$/);
+      assert.match(utils.YYYYMMDDHHmmss(1428894236645, {}), /^(19|20)\d{2}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01]) (0[0-9]|1[0-9]|2[0-3]):([0-5][0-9]):([0-5][0-9]$)/);
     });
   });
 
@@ -192,7 +192,7 @@ describe('test/date.test.ts', () => {
   describe('accessLogDate()', () => {
     it('accessLogDate() should return an access log format date string', () => {
       // 16/Apr/2013:16:40:09 +0800
-      assert.match(utility.accessLogDate(new Date()), /^\d{2}\/\w{3}\/\d{4}:\d{2}:\d{2}:\d{2} [\+\-]\d{4}$/);
+      assert.match(utility.accessLogDate(new Date()), /^(0[1-9]|[12]\d|3[01])\/(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\/\d{4}:\d{2}:\d{2}:\d{2} [+-](0[0-9]|1[0-3])\d{2}$/);
       assert.equal(moment().format('DD/MMM/YYYY:HH:mm:ss ZZ'), utility.accessLogDate(new Date()));
       for (let m = 1; m <= 12; m++) {
         for (let d = 1; d <= 28; d++) {
@@ -238,4 +238,46 @@ describe('test/date.test.ts', () => {
       assert.equal((utility.timestamp('1385091596000') as Date).getTime(), 1385091596000);
     });
   });
+
+  describe('dateToUnixTimestamp()', () => {
+    it('should convert Date object to Unix timestamp in seconds', () => {
+      const date = new Date('2023-10-01T00:00:00Z');
+      const timestamp = utility.dateToUnixTimestamp(date);
+      assert.equal(timestamp, 1696118400);
+    });
+  });
+
+  describe('test/date.test.ts', () => {
+    describe('getDateFromMilliseconds()', () => {
+      it('should return access log date format', () => {
+        const milliseconds = Date.now();
+        const result = utility.getDateFromMilliseconds(milliseconds, utility.DateFormat.DateTimeWithTimeZone);
+        assert.match(result, /^\d{2}\/[A-Za-z]{3}\/\d{4}:\d{2}:\d{2}:\d{2} [+-]\d{4}$/);
+      });
+
+      it('should return log date format with milliseconds', () => {
+        const milliseconds = Date.now();
+        const result = utility.getDateFromMilliseconds(milliseconds, utility.DateFormat.DateTimeWithMilliSeconds);
+        assert.match(result, /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3}$/);
+      });
+
+      it('should return date time format with seconds', () => {
+        const milliseconds = Date.now();
+        const result = utility.getDateFromMilliseconds(milliseconds, utility.DateFormat.DateTimeWithSeconds);
+        assert.match(result, /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/);
+      });
+
+      it('should return Unix timestamp', () => {
+        const milliseconds = Date.now();
+        const result = utility.getDateFromMilliseconds(milliseconds, utility.DateFormat.UnixTimestamp);
+        assert.match(result, /^\d+$/);
+      });
+
+      it('should return default date format', () => {
+        const milliseconds = Date.now();
+        const result = utility.getDateFromMilliseconds(milliseconds);
+        assert.match(result, /^\d{4}-\d{2}-\d{2}$/);
+      });
+    });
+  });
 });