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Zeitzonen: Verbesserung der Zeitzonenberechnung und -darstellung, einschließlich Fehlerbehandlung und Anpassung der Offset-Berechnung.

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Akamaru
2025-04-20 20:34:24 +02:00
parent 936c202cc1
commit 6c92553408
1 changed files with 151 additions and 130 deletions
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281
zeitzonen/index.html
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@@ -431,21 +431,21 @@
// Timezone data // Timezone data
const majorTimezones = [ const majorTimezones = [
{ label: "Pacific (Los Angeles)", id: "America/Los_Angeles", offset: -8 }, { label: "Pacific (Los Angeles)", id: "America/Los_Angeles" },
{ label: "Mountain (Denver)", id: "America/Denver", offset: -7 }, { label: "Mountain (Denver)", id: "America/Denver" },
{ label: "Central (Chicago)", id: "America/Chicago", offset: -6 }, { label: "Central (Chicago)", id: "America/Chicago" },
{ label: "Eastern (New York)", id: "America/New_York", offset: -5 }, { label: "Eastern (New York)", id: "America/New_York" },
{ label: "Brasilien (São Paulo)", id: "America/Sao_Paulo", offset: -3 }, { label: "Brasilien (São Paulo)", id: "America/Sao_Paulo" },
{ label: "Großbritannien (London)", id: "Europe/London", offset: 0 }, { label: "Großbritannien (London)", id: "Europe/London" },
{ label: "Westeuropa (Paris, Berlin)", id: "Europe/Berlin", offset: 1 }, { label: "Westeuropa (Paris, Berlin)", id: "Europe/Berlin" },
{ label: "Osteuropa (Athen)", id: "Europe/Athens", offset: 2 }, { label: "Osteuropa (Athen)", id: "Europe/Athens" },
{ label: "Moskau", id: "Europe/Moscow", offset: 3 }, { label: "Moskau", id: "Europe/Moscow" },
{ label: "Dubai", id: "Asia/Dubai", offset: 4 }, { label: "Dubai", id: "Asia/Dubai" },
{ label: "Indien (Mumbai)", id: "Asia/Kolkata", offset: 5.5 }, { label: "Indien (Mumbai)", id: "Asia/Kolkata" },
{ label: "China (Peking)", id: "Asia/Shanghai", offset: 8 }, { label: "China (Peking)", id: "Asia/Shanghai" },
{ label: "Japan (Tokio)", id: "Asia/Tokyo", offset: 9 }, { label: "Japan (Tokio)", id: "Asia/Tokyo" },
{ label: "Australien (Sydney)", id: "Australia/Sydney", offset: 10 }, { label: "Australien (Sydney)", id: "Australia/Sydney" },
{ label: "Neuseeland (Auckland)", id: "Pacific/Auckland", offset: 12 } { label: "Neuseeland (Auckland)", id: "Pacific/Auckland" }
]; ];
// Populate timezone dropdowns // Populate timezone dropdowns
@@ -618,17 +618,22 @@
container.innerHTML = ''; container.innerHTML = '';
majorTimezones.forEach(tz => { majorTimezones.forEach(tz => {
// Create a timezone card
const card = document.createElement('div'); const card = document.createElement('div');
card.className = 'timezone-card'; card.className = 'timezone-card';
const dateInTimezone = getDateInTimezone(referenceDate, tz.id);
// Format time and date using Intl.DateTimeFormat for the specific timezone
const timeFormatter = new Intl.DateTimeFormat('de-DE', { timeZone: tz.id, hour: '2-digit', minute: '2-digit' });
const dateFormatter = new Intl.DateTimeFormat('de-DE', { timeZone: tz.id, year: 'numeric', month: '2-digit', day: '2-digit' });
const timeStr = timeFormatter.format(referenceDate);
const dateStr = dateFormatter.format(referenceDate);
const offsetStr = getTimezoneOffsetString(referenceDate, tz.id);
card.innerHTML = ` card.innerHTML = `
<h3>${tz.label}</h3> <h3>${tz.label}</h3>
<div class="time">${dateInTimezone.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })}</div> <div class="time">${timeStr}</div>
<div class="date">${dateInTimezone.toLocaleDateString()}</div> <div class="date">${dateStr}</div>
<div class="timezone-offset">${getTimezoneOffsetString(dateInTimezone, tz.id)}</div> <div class="timezone-offset">${offsetStr}</div>
`; `;
container.appendChild(card); container.appendChild(card);
@@ -637,66 +642,119 @@
// Calculate and show timezone results // Calculate and show timezone results
document.getElementById('calculate-btn').addEventListener('click', () => { document.getElementById('calculate-btn').addEventListener('click', () => {
const dateStr = dateInput.value; const dateStr = dateInput.value; // "YYYY-MM-DD"
const timeStr = timeInput.value; const timeStr = timeInput.value; // "HH:mm"
const sourceTimezone = sourceTimezoneSelect.value; const sourceTimezoneId = sourceTimezoneSelect.value;
const targetTimezone = targetTimezoneSelect.value; const targetTimezoneId = targetTimezoneSelect.value;
if (!dateStr || !timeStr) { if (!dateStr || !timeStr || !sourceTimezoneId || !targetTimezoneId) {
alert('Bitte gib ein Datum und eine Zeit ein'); alert('Bitte gib ein Datum, eine Zeit und beide Zeitzonen an.');
return; return;
} }
// Create date object from inputs try {
const [year, month, day] = dateStr.split('-').map(Number); // --- Korrekte Logik zur Erstellung des Referenz-Zeitpunkts ---
const [hours, minutes] = timeStr.split(':').map(Number);
// Erstelle ein Datum im lokalen Format
const inputDate = new Date(year, month - 1, day, hours, minutes);
// Wir erstellen eine Referenzzeit, die der Eingabe in der Quell-Zeitzone entspricht
const utcMilliseconds = Date.UTC(year, month - 1, day, hours, minutes);
const sourceOffset = getTimezoneOffsetHours(sourceTimezone) * 60 * 60 * 1000;
const referenceDate = new Date(utcMilliseconds - sourceOffset);
// Zeige nur die Quell- und Zielzeitzone an // 1. Parse input date/time components
displayConversionResult(referenceDate, sourceTimezone, targetTimezone); const [year, month, day] = dateStr.split('-').map(Number);
const [hours, minutes] = timeStr.split(':').map(Number);
// 2. Helper function to get offset in hours for a given date and timezone
function getOffsetHours(date, timezone) {
try {
const formatter = new Intl.DateTimeFormat('en-US', {
timeZone: timezone,
timeZoneName: 'longOffset' // e.g., GMT-07:00 or GMT+02:00
});
const parts = formatter.formatToParts(date);
const offsetPart = parts.find(part => part.type === 'timeZoneName');
if (offsetPart) {
// Extract hours and minutes from GMT string (e.g., "GMT-7", "GMT+5:30")
const match = offsetPart.value.match(/GMT([-+])(\d{1,2})(?::(\d{2}))?/);
if (match) {
const sign = match[1] === '-' ? -1 : 1;
const hourOffset = parseInt(match[2], 10);
const minuteOffset = match[3] ? parseInt(match[3], 10) : 0;
return sign * (hourOffset + minuteOffset / 60);
}
}
} catch (e) {
console.warn(`Could not determine offset for timezone ${timezone}`, e);
}
// Fallback: Browser's local offset for the given date (less accurate for the *target* zone)
console.warn(`Falling back to local offset for timezone ${timezone}`);
return -date.getTimezoneOffset() / 60;
}
// 3. Estimate the UTC time by initially assuming the input time *was* UTC.
// We need a Date object to pass to getOffsetHours.
const guessedUtcMillis = Date.UTC(year, month - 1, day, hours, minutes);
const tempDate = new Date(guessedUtcMillis);
// 4. Get the actual offset of the source timezone *at that time*.
const sourceOffsetHours = getOffsetHours(tempDate, sourceTimezoneId);
// 5. Calculate the correct UTC milliseconds.
// The input time (e.g., 20:00 Berlin) corresponds to a UTC time that is
// 'sourceOffsetHours' earlier than 20:00 UTC.
// So, we subtract the offset from the initial UTC guess.
const correctUtcMillis = guessedUtcMillis - (sourceOffsetHours * 3600 * 1000);
// 6. Create the final Date object representing the correct moment in time.
const referenceDate = new Date(correctUtcMillis);
// 7. Display the results using this correct referenceDate.
displayConversionResult(referenceDate, sourceTimezoneId, targetTimezoneId);
} catch (error) {
console.error("Fehler bei der Zeitzonenberechnung:", error);
// Add more specific error message if Intl fails (e.g., invalid timezone ID)
if (error instanceof RangeError) {
alert(`Fehler: Eine der angegebenen Zeitzonen ('${sourceTimezoneId}' oder '${targetTimezoneId}') ist ungültig oder wird vom Browser nicht unterstützt.`);
} else {
alert("Ein unerwarteter Fehler bei der Berechnung der Zeit ist aufgetreten. Bitte überprüfe die Eingabe.");
}
}
}); });
// Display conversion result between source and target timezone // Display conversion result between source and target timezone
function displayConversionResult(referenceDate, sourceTimezone, targetTimezone) { function displayConversionResult(referenceDate, sourceTimezoneId, targetTimezoneId) {
const container = document.getElementById('timezone-result'); const container = document.getElementById('timezone-result');
container.innerHTML = ''; container.innerHTML = '';
const sourceTz = majorTimezones.find(tz => tz.id === sourceTimezone); const sourceTzData = majorTimezones.find(tz => tz.id === sourceTimezoneId);
const targetTz = majorTimezones.find(tz => tz.id === targetTimezone); const targetTzData = majorTimezones.find(tz => tz.id === targetTimezoneId);
if (!sourceTz || !targetTz) return; if (!sourceTzData || !targetTzData) {
console.error("Source or target timezone data not found in majorTimezones list.");
// Quell-Zeitzone Karte return;
const sourceCard = document.createElement('div'); }
sourceCard.className = 'timezone-card';
const dateInSourceTimezone = getDateInTimezone(referenceDate, sourceTimezone);
sourceCard.innerHTML = `
<h3>${sourceTz.label}</h3>
<div class="time">${dateInSourceTimezone.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })}</div>
<div class="date">${dateInSourceTimezone.toLocaleDateString()}</div>
<div class="timezone-offset">${getTimezoneOffsetString(dateInSourceTimezone, sourceTimezone)}</div>
`;
// Ziel-Zeitzone Karte
const targetCard = document.createElement('div');
targetCard.className = 'timezone-card';
const dateInTargetTimezone = getDateInTimezone(referenceDate, targetTimezone);
targetCard.innerHTML = `
<h3>${targetTz.label}</h3>
<div class="time">${dateInTargetTimezone.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })}</div>
<div class="date">${dateInTargetTimezone.toLocaleDateString()}</div>
<div class="timezone-offset">${getTimezoneOffsetString(dateInTargetTimezone, targetTimezone)}</div>
`;
// --- Funktion zum Erstellen einer Karte ---
function createResultCard(timezoneData, dateToFormat) {
const card = document.createElement('div');
card.className = 'timezone-card';
const timeFormatter = new Intl.DateTimeFormat('de-DE', { timeZone: timezoneData.id, hour: '2-digit', minute: '2-digit' });
const dateFormatter = new Intl.DateTimeFormat('de-DE', { timeZone: timezoneData.id, year: 'numeric', month: '2-digit', day: '2-digit' });
const timeStr = timeFormatter.format(dateToFormat);
const dateStr = dateFormatter.format(dateToFormat);
const offsetStr = getTimezoneOffsetString(dateToFormat, timezoneData.id);
card.innerHTML = `
<h3>${timezoneData.label}</h3>
<div class="time">${timeStr}</div>
<div class="date">${dateStr}</div>
<div class="timezone-offset">${offsetStr}</div>
`;
return card;
}
// Erstelle Quell- und Ziel-Karten
const sourceCard = createResultCard(sourceTzData, referenceDate);
const targetCard = createResultCard(targetTzData, referenceDate);
container.appendChild(sourceCard); container.appendChild(sourceCard);
// Pfeil zwischen den Karten // Pfeil zwischen den Karten
@@ -708,78 +766,41 @@
container.appendChild(targetCard); container.appendChild(targetCard);
} }
// Helper function to get a date object in a specific timezone
function getDateInTimezone(date, timezone) {
// Nutze die eingebaute Zeitzonenunterstützung von JavaScript
const options = { timeZone: timezone };
const formatter = new Intl.DateTimeFormat('en-US', {
...options,
year: 'numeric',
month: 'numeric',
day: 'numeric',
hour: 'numeric',
minute: 'numeric',
second: 'numeric',
hour12: false
});
const parts = formatter.formatToParts(date);
const dateObj = {};
parts.forEach(part => {
if (part.type !== 'literal') {
dateObj[part.type] = part.value;
}
});
return new Date(
dateObj.year,
parseInt(dateObj.month, 10) - 1,
dateObj.day,
dateObj.hour,
dateObj.minute,
dateObj.second
);
}
// Helper function to get timezone offset string (e.g., GMT+1) // Helper function to get timezone offset string (e.g., GMT+1)
function getTimezoneOffsetString(date, timezone) { function getTimezoneOffsetString(date, timezone) {
if (timezone) { try {
// Ermittle den tatsächlichen Offset für das Datum in der Zeitzone // Nutze Intl.DateTimeFormat, um den Offset für das spezifische Datum und die Zeitzone zu erhalten
const testDate = new Date(date); // Wir erstellen eine Kopie
// Formatiere das Datum in der angegebenen Zeitzone und hole den Offset
const formatter = new Intl.DateTimeFormat('en-US', { const formatter = new Intl.DateTimeFormat('en-US', {
timeZone: timezone, timeZone: timezone,
timeZoneName: 'longOffset' timeZoneName: 'longOffset' // Gibt z.B. "GMT+01:00" zurück
}); });
// Extrahiere den GMT-Offset-String aus der formatierten Ausgabe // Formatiere das Datum, um den Offset-String zu extrahieren
const formattedDate = formatter.format(testDate); const formattedParts = formatter.formatToParts(date);
const offsetMatch = formattedDate.match(/GMT([-+]\d+)/); const offsetPart = formattedParts.find(part => part.type === 'timeZoneName');
if (offsetMatch) { if (offsetPart) {
return `GMT${offsetMatch[1]}`; // Extrahiere den numerischen Teil (z.B. +1, -8)
} const match = offsetPart.value.match(/GMT([-+]\d{1,2}(?::\d{2})?)/);
if (match && match[1]) {
// Fallback: Verwende den statischen Offset aus majorTimezones // Vereinfache zu GMT+X oder GMT-X
const tz = majorTimezones.find(t => t.id === timezone); const numericOffset = parseInt(match[1].split(':')[0], 10);
if (tz) { const sign = numericOffset >= 0 ? '+' : '-';
const sign = tz.offset >= 0 ? '+' : '-'; return `GMT${sign}${Math.abs(numericOffset)}`;
return `GMT${sign}${Math.abs(tz.offset)}`; }
return offsetPart.value; // Fallback auf den vollen String
} }
} catch (error) {
console.warn(`Konnte Offset für Zeitzone ${timezone} nicht ermitteln:`, error);
// Fallback: Verwende den Offset der lokalen Zeitzone des Browsers für dieses Datum
const localOffsetMinutes = date.getTimezoneOffset();
const offsetHours = -localOffsetMinutes / 60;
const sign = offsetHours >= 0 ? '+' : '-';
return `GMT${sign}${Math.abs(offsetHours)} (Lokal)`;
} }
// Wenn keine Zeitzone angegeben oder gefunden wurde, verwende den lokalen Offset
const offset = date.getTimezoneOffset() * -1 / 60;
const sign = offset >= 0 ? '+' : '-';
return `GMT${sign}${Math.abs(offset)}`;
}
// Helper function to get timezone offset in hours // Sicherer Fallback, falls alles fehlschlägt
function getTimezoneOffsetHours(timezone) { return 'GMT?';
const tz = majorTimezones.find(t => t.id === timezone);
return tz ? tz.offset : 0;
} }
// Generate initial timezone cards // Generate initial timezone cards