diff --git a/package.json b/package.json
index cb7e4e3..d74fc92 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "zeed",
   "type": "module",
-  "version": "0.19.3",
+  "version": "0.19.4",
   "description": "🌱 Simple foundation library",
   "author": {
     "name": "Dirk Holtwick",
diff --git a/src/common/data/day-legacy.ts b/src/common/data/day-legacy.ts
index 7d69cfb..f81f9ed 100644
--- a/src/common/data/day-legacy.ts
+++ b/src/common/data/day-legacy.ts
@@ -49,9 +49,9 @@ export class Day {
     return Day.from(+dateString.replace(/[^0-9]/g, '').slice(0, 8))
   }
 
-  static fromDate(date: Date, gmt = false): Day {
+  static fromDate(date: Date, utc = false): Day {
     return (
-      gmt
+      utc
         ? Day.fromString(date.toISOString().substr(0, 10))
         : Day.from(
           date.getFullYear() * 10000
@@ -61,11 +61,16 @@ export class Day {
     ) as Day
   }
 
+  static fromDateUTC(date: Date): Day {
+    return Day.fromDate(date, true)
+  }
+
+  /** @deprecated use fromDateUTC */
   static fromDateGMT(date: Date): Day {
     return Day.fromDate(date, true)
   }
 
-  static from(value: DayInputLegacy, gmt = false): Day | undefined {
+  static from(value: DayInputLegacy, utc = false): Day | undefined {
     if (typeof value === 'number') {
       if (value < 100)
         return
@@ -81,7 +86,7 @@ export class Day {
       return new Day(year * 10000 + month * 100 + day)
     }
     else if (value instanceof Date) {
-      return Day.fromDate(value, gmt)
+      return Day.fromDate(value, utc)
     }
     else if (value instanceof Day) {
       return value
@@ -110,8 +115,8 @@ export class Day {
     )
   }
 
-  toDate(gmt = false): Date {
-    return gmt
+  toDate(utc = false): Date {
+    return utc
       ? new Date(`${this.toString()}T00:00:00.000Z`)
       : new Date(
         this.days / 10000, // year
@@ -120,6 +125,11 @@ export class Day {
       )
   }
 
+  toDateUTC() {
+    return this.toDate(true)
+  }
+
+  /** @deprecated use toDateUTC */
   toDateGMT() {
     return this.toDate(true)
   }
@@ -141,8 +151,8 @@ export class Day {
   dayOffset(offset: number): Day {
     // Important! Don't use local time here due to summer/winter time days can
     // be longer or shorter!
-    return Day.fromDateGMT(
-      new Date(this.toDateGMT().getTime() + offset * DAY_MS),
+    return Day.fromDateUTC(
+      new Date(this.toDateUTC().getTime() + offset * DAY_MS),
     )
   }
 
@@ -167,7 +177,7 @@ export class Day {
 
   daysUntil(otherDay: DayInputLegacy): number {
     return Math.round(
-      (new Day(otherDay)?.toDateGMT().getTime() - this.toDateGMT().getTime())
+      (new Day(otherDay)?.toDateUTC().getTime() - this.toDateUTC().getTime())
       / DAY_MS,
     )
   }
diff --git a/src/common/data/day.spec.ts b/src/common/data/day.spec.ts
index 95c257a..49d029a 100644
--- a/src/common/data/day.spec.ts
+++ b/src/common/data/day.spec.ts
@@ -75,7 +75,7 @@ describe('days', () => {
       // This only works locally, but not on Github Actions ;)
       // expect(day?.toDate()).toEqual(`1987-12-30T23:00:00.000Z`)
 
-      expect(day?.toDateGMT()).toEqual(new Date('1987-12-31T00:00:00.000Z'))
+      expect(day?.toDateUTC()).toEqual(new Date('1987-12-31T00:00:00.000Z'))
 
       expect(Day.fromString('2000-01-01')?.days).toEqual(20000101)
 
@@ -87,7 +87,7 @@ describe('days', () => {
       expect(Day.from([2022, 12, 31])?.days).toBe(20221231)
 
       // Following depend on timezone
-      // let day2 = Day.fromDateGMT(new Date("1987-12-31T00:02:03"))
+      // let day2 = Day.fromDateUTC(new Date("1987-12-31T00:02:03"))
       // expect(day2?.days).toEqual(19871230)
       // expect(new Date().toISOString().startsWith(today().toString())).toBe(true)
     }
@@ -102,7 +102,7 @@ describe('days', () => {
       // This only works locally, but not on Github Actions ;)
       // expect(day?.toDate()).toEqual(`1987-12-30T23:00:00.000Z`)
 
-      // expect(day?.toDateGMT()).toEqual(new Date("1987-12-31T00:00:00.000Z"))
+      // expect(day?.toDateUTC()).toEqual(new Date("1987-12-31T00:00:00.000Z"))
 
       // expect(Day.fromString("2000-01-01")?.days).toEqual(20000101)
 
@@ -114,7 +114,7 @@ describe('days', () => {
       // expect(Day.from([2022, 12, 31])?.days).toBe(20221231)
 
       // Following depend on timezone
-      // let day2 = Day.fromDateGMT(new Date("1987-12-31T00:02:03"))
+      // let day2 = Day.fromDateUTC(new Date("1987-12-31T00:02:03"))
       // expect(day2?.days).toEqual(19871230)
       // expect(new Date().toISOString().startsWith(today().toString())).toBe(true)
     }
diff --git a/src/common/data/day.ts b/src/common/data/day.ts
index 7225c7b..f38e15f 100644
--- a/src/common/data/day.ts
+++ b/src/common/data/day.ts
@@ -27,8 +27,8 @@ export function dayToParts(day: DayValue): [number, number, number] {
   return [dayYear(day), dayMonth(day), dayDay(day)]
 }
 
-export function dayToDate(day: DayValue, gmt = false): Date {
-  return gmt
+export function dayToDate(day: DayValue, utc = false): Date {
+  return utc
     ? new Date(`${dayToString(day)}T00:00:00.000Z`)
     : new Date(
       day / 10000, // year
@@ -43,7 +43,7 @@ export function dayFromToday(): DayValue {
 
 export function dayFromAny(
   value: DayInput,
-  gmt = false,
+  utc = false,
 ): DayValue | undefined {
   if (typeof value === 'number') {
     if (value < 100)
@@ -58,19 +58,24 @@ export function dayFromAny(
     return dayFromParts(year, month, day)
   }
   else if (value instanceof Date) {
-    return dayFromDate(value, gmt)
+    return dayFromDate(value, utc)
     // } else if (value instanceof Day) {
     //   return value.days
   }
 }
 
+export function dayToDateUTC(day: DayValue): Date {
+  return dayToDate(day, true)
+}
+
+/** @deprecated use dayToDateUTC */
 export function dayToDateGMT(day: DayValue): Date {
   return dayToDate(day, true)
 }
 
-export function dayFromDate(date: Date, gmt = false): DayValue {
+export function dayFromDate(date: Date, utc = false): DayValue {
   return (
-    gmt
+    utc
       ? dayFromString(date.toISOString())
       : date.getFullYear() * 10000
       + (date.getMonth() + 1) * 100
@@ -78,16 +83,21 @@ export function dayFromDate(date: Date, gmt = false): DayValue {
   )!
 }
 
+export function dayFromDateUTC(date: Date): DayValue {
+  return dayFromDate(date, true)
+}
+
+/** @deprecated use dayFromDateUTC */
 export function dayFromDateGMT(date: Date): DayValue {
   return dayFromDate(date, true)
 }
 
-export function dayToTimestamp(day: DayValue, gmt = true): number {
-  return dayToDate(day, gmt).getTime()
+export function dayToTimestamp(day: DayValue, utc = true): number {
+  return dayToDate(day, utc).getTime()
 }
 
-export function dayFromTimestamp(ms: number, gmt = true): DayValue {
-  return dayFromDate(new Date(ms), gmt)
+export function dayFromTimestamp(ms: number, utc = true): DayValue {
+  return dayFromDate(new Date(ms), utc)
 }
 
 export function dayToString(day: DayValue, sep = '-') {
diff --git a/src/common/time.spec.ts b/src/common/time.spec.ts
index d4d129c..db8ae24 100644
--- a/src/common/time.spec.ts
+++ b/src/common/time.spec.ts
@@ -1,5 +1,5 @@
 import { sleep } from './exec'
-import { duration, parseDate } from './time'
+import { datetimeToLocal, datetimeToUTC, duration, parseDate } from './time'
 
 describe('time.spec', () => {
   it('should measure', async () => {
@@ -27,4 +27,13 @@ describe('time.spec', () => {
     const date = parseDate(inputDate)
     expect(date).toBe(inputDate)
   })
+
+  it('should convert dates', () => {
+    const dateLocal = new Date('2022-01-01T12:00:00')
+    // expect(dateLocal?.toString()).toMatchInlineSnapshot(`"Sat Jan 01 2022 12:00:00 GMT+0100 (Central European Standard Time)"`)
+    // expect(dateLocal.toISOString()).toMatchInlineSnapshot(`"2022-01-01T11:00:00.000Z"`)
+    // expect(datetimeToUTC(dateLocal)).toMatchInlineSnapshot(`2022-01-01T12:00:00.000Z`)
+    // expect(datetimeToLocal(dateLocal)).toMatchInlineSnapshot(`2022-01-01T10:00:00.000Z`)
+    expect(datetimeToLocal(datetimeToUTC(dateLocal))).toEqual(dateLocal)
+  })
 })
diff --git a/src/common/time.ts b/src/common/time.ts
index 3b637ca..20c5004 100644
--- a/src/common/time.ts
+++ b/src/common/time.ts
@@ -69,3 +69,29 @@ export function duration() {
     // })
   }
 }
+
+/** If you parsed a date without time zone, you may need to shift it to local time */
+export function datetimeToLocal(fromDate: Date): Date {
+  return new Date(
+    fromDate.getUTCFullYear(),
+    fromDate.getUTCMonth(),
+    fromDate.getUTCDate(),
+    fromDate.getUTCHours(),
+    fromDate.getUTCMinutes(),
+    fromDate.getUTCSeconds(),
+    fromDate.getUTCMilliseconds(),
+  )
+}
+
+/** If you parsed a date without time zone, you may need to shift it to UTC time */
+export function datetimeToUTC(fromDate: Date): Date {
+  return new Date(Date.UTC(
+    fromDate.getFullYear(),
+    fromDate.getMonth(),
+    fromDate.getDate(),
+    fromDate.getHours(),
+    fromDate.getMinutes(),
+    fromDate.getSeconds(),
+    fromDate.getMilliseconds(),
+  ))
+}