diff --git a/package.json b/package.json
index 368efd6..200f893 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "zeed",
   "type": "module",
-  "version": "0.24.21",
+  "version": "0.24.22",
   "description": "🌱 Simple foundation library",
   "author": {
     "name": "Dirk Holtwick",
@@ -69,18 +69,18 @@
     "watch": "nr build -- --watch src"
   },
   "devDependencies": {
-    "@antfu/eslint-config": "^3.6",
+    "@antfu/eslint-config": "^3.7",
     "@antfu/ni": "^0.23.0",
-    "@types/node": "^22.5.5",
-    "@vitejs/plugin-vue": "^5.1.3",
+    "@types/node": "^22.7.2",
+    "@vitejs/plugin-vue": "^5.1.4",
     "@vitest/browser": "^2.1.1",
     "@vitest/coverage-v8": "^2.1.1",
-    "esbuild": "^0.23.1",
+    "esbuild": "^0.24.0",
     "eslint": "^9",
-    "playwright": "^1.47.1",
-    "tsup": "^8.2.4",
+    "playwright": "^1.47.2",
+    "tsup": "^8.3.0",
     "typescript": "^5.6.2",
-    "vite": "^5.4.5",
+    "vite": "^5.4.8",
     "vitest": "^2.1.1"
   },
   "pnpm": {
diff --git a/src/common/time.spec.ts b/src/common/time.spec.ts
index 3a00aae..e6ceb1d 100644
--- a/src/common/time.spec.ts
+++ b/src/common/time.spec.ts
@@ -1,5 +1,5 @@
 import { sleep } from './exec'
-import { dateFromSeconds, datetimeToLocal, datetimeToUTC, duration, formatMilliseconds, getPerformanceTimestamp, getTimestamp, getTimestampInSeconds, parseDate } from './time'
+import { dateFromSeconds, datetimeToLocal, datetimeToUTC, duration, formatMilliseconds, getPerformanceTimestamp, getTimestamp, getTimestampInSeconds, parseDate, timestampMillisecondsToSeconds, timestampSecondsToMilliseconds } from './time'
 
 describe('time.spec', () => {
   it('should measure', async () => {
@@ -85,4 +85,28 @@ describe('time.spec', () => {
     const utcDate = datetimeToUTC(date)
     expect(utcDate).toEqual(new Date('2022-01-01T12:00:00Z'))
   })
+
+  it('should convert milliseconds to seconds', () => {
+    const ts = 1609459200000 // 2021-01-01T00:00:00.000Z
+    const result = timestampMillisecondsToSeconds(ts)
+    expect(result).toBe(1609459200)
+  })
+
+  it('should log a warning if the timestamp is already in seconds', () => {
+    const ts = 1609459200
+    const result = timestampMillisecondsToSeconds(ts)
+    expect(result).toBe(1609459200)
+  })
+
+  it('should convert seconds to milliseconds', () => {
+    const ts = 1609459200 // 2021-01-01T00:00:00Z
+    const result = timestampSecondsToMilliseconds(ts)
+    expect(result).toBe(1609459200000)
+  })
+
+  it('should log a warning if the timestamp is already in milliseconds', () => {
+    const ts = 1609459200000
+    const result = timestampMillisecondsToSeconds(ts)
+    expect(result).toBe(1609459200)
+  })
 })
diff --git a/src/common/time.ts b/src/common/time.ts
index 8aa40f4..cbcdc0f 100644
--- a/src/common/time.ts
+++ b/src/common/time.ts
@@ -110,3 +110,38 @@ export function datetimeToUTC(fromDate: Date): Date {
     fromDate.getMilliseconds(),
   ))
 }
+
+/** ms -> s with simple check */
+export function timestampMillisecondsToSeconds(ts: number) {
+  if (ts <= 0)
+    return 0
+  if (ts < 1000000000000) {
+    return ts
+    // log.warn('Timestamp might already be in seconds?', ts)
+  }
+  return Math.floor(ts / 1000)
+}
+
+/** s -> ms with simple check */
+export function timestampSecondsToMilliseconds(ts: number) {
+  if (ts <= 0)
+    return 0
+  if (ts > 1000000000000) {
+    return ts
+    // log.warn('Timestamp might already be in milliseconds?', ts)
+  }
+  return Math.floor(ts * 1000)
+}
+
+export const TIME_YEAR_MS = 31536000000 // 365 * 24 * 60 * 60 * 1000
+export const TIME_YEAR_S = 31536000 // 365 * 24 * 60 * 60
+export const TIME_MONTH_MS = 2592000000 // 30 * 24 * 60 * 60 * 1000
+export const TIME_MONTH_S = 2592000 // 30 * 24 * 60 * 60
+export const TIME_WEEK_MS = 604800000 // 7 * 24 * 60 * 60 * 1000
+export const TIME_WEEK_S = 604800 // 7 * 24 * 60 * 60
+export const TIME_DAY_MS = 86400000 // 24 * 60 * 60 * 1000
+export const TIME_DAY_S = 86400 // 24 * 60 * 60
+export const TIME_HOUR_MS = 3600000 // 60 * 60 * 1000
+export const TIME_HOUR_S = 3600 // 60 * 60
+export const TIME_MINUTE_MS = 60000 // 60 * 1000
+export const TIME_MINUTE_S = 60 // 60
diff --git a/vitest.config.ts b/vitest.config.ts
index a4c1066..fadc9ea 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -1,6 +1,6 @@
-import type { UserConfig } from 'vitest'
 /// <reference types="vitest" />
-/* eslint-disable no-console */
+
+import type { UserConfig } from 'vitest'
 import { resolve } from 'node:path'
 import process from 'node:process'
 import { defineConfig } from 'vite'