JavaScript Temporal API：现代日期时间处理

            
const now = Temporal.Instant.now()
console.log(now.toString()); // e.g., 2024-02-29T15:30:00.123456789Z

            

              
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const nowInUTC = Temporal.Now.zonedDateTime('UTC');
console.log(nowInUTC.toString()); // e.g., 2024-02-29T15:30:00.123456789Z[UTC]

const nowInNewYork = Temporal.Now.zonedDateTime('America/New_York');
console.log(nowInNewYork.toString()); // e.g., 2024-02-29T10:30:00.123456789-05:00[America/New_York]

            

              
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const today = Temporal.Now.plainDateISO()
console.log(today.toString()); // e.g., 2024-02-29

            

              
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const nowTime = Temporal.Now.plainTimeISO()
console.log(nowTime.toString()); // e.g., 15:30:00.123456789

            

              
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const nowDateTime = Temporal.Now.plainDateTimeISO()
console.log(nowDateTime.toString()); // e.g., 2024-02-29T15:30:00.123456789

            

              
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const february29th = Temporal.PlainMonthDay.from({ month: 2, day: 29 });
console.log(february29th.toString()); // --02-29

            

              
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const yearMonth = Temporal.PlainYearMonth.from({ year: 2024, month: 2 });
console.log(yearMonth.toString()); // 2024-02

            

              
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const duration = Temporal.Duration.from({ days: 3, hours: 2, minutes: 30 });
console.log(duration.toString()); // P3DT02H30M

            

              
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const timeZone = Temporal.TimeZone.from('America/Los_Angeles');
console.log(timeZone.id); // America/Los_Angeles

            

              
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const isoCalendar = Temporal.Calendar.from('iso8601');
console.log(isoCalendar.toString()); // ISO8601

            

              
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const instant = Temporal.Instant.from('2024-02-29T15:30:00Z');
const timeZone = Temporal.TimeZone.from('America/Los_Angeles');
const zonedDateTime = instant.toZonedDateTime(timeZone);
console.log(zonedDateTime.toString()); // e.g., 2024-02-29T07:30:00-08:00[America/Los_Angeles]

            

              
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const newYorkTime = Temporal.Now.zonedDateTime('America/New_York');
const londonTime = newYorkTime.toZonedDateTime(Temporal.TimeZone.from('Europe/London'));
console.log(londonTime.toString()); // e.g., 2024-02-29T12:30:00+00:00[Europe/London]

            

              
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const berlinTime = Temporal.Now.zonedDateTime('Europe/Berlin');
console.log(berlinTime.toString());

// Assuming DST changes at 02:00:00 on the given date in Europe/Berlin:

const nextDay = berlinTime.add(Temporal.Duration.from({ days: 1 }));
console.log(nextDay.toString()); // Example: Time might 'jump' or 'skip' an hour depending on DST.

            

              
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const plainDate = Temporal.PlainDate.from('2024-02-29');
const duration = Temporal.Duration.from({ days: 10 });
const futureDate = plainDate.add(duration);
console.log(futureDate.toString()); // 2024-03-10

const dateTime = Temporal.PlainDateTime.from('2024-02-29T10:00:00');
const durationHours = Temporal.Duration.from({ hours: 3 });
const futureDateTime = dateTime.add(durationHours);
console.log(futureDateTime.toString()); // 2024-02-29T13:00:00

            

              
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const startDate = Temporal.PlainDate.from('2024-02-01');
const endDate = Temporal.PlainDate.from('2024-02-29');
const duration = startDate.until(endDate);
console.log(duration.toString()); // P28D

            

              
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const date1 = Temporal.PlainDate.from('2024-02-29');
const date2 = Temporal.PlainDate.from('2024-02-29');
console.log(date1.equals(date2)); // true

const comparisonResult = date1.compare(Temporal.PlainDate.from('2024-03-01'));
console.log(comparisonResult); // -1 (date1 is earlier than the other date)

            

              
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const now = Temporal.Now.zonedDateTime('America/New_York');
console.log(now.toLocaleString('en-US')); // e.g., 2/29/2024, 10:30:00 AM
console.log(now.toLocaleString('fr-FR')); // e.g., 29/02/2024 10:30:00

            

              
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const now = Temporal.Now.plainDateTimeISO()
const formattedDate = `${now.year}-${String(now.month).padStart(2, '0')}-${String(now.day).padStart(2, '0')}`;
console.log(formattedDate); // e.g., 2024-02-29

            

              
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const meetingTimeInUTC = Temporal.PlainDateTime.from('2024-03-15T14:00:00');
const londonTZ = Temporal.TimeZone.from('Europe/London');
const newYorkTZ = Temporal.TimeZone.from('America/New_York');
const londonMeeting = meetingTimeInUTC.toZonedDateTime(londonTZ);
const newYorkMeeting = londonMeeting.toZonedDateTime(newYorkTZ);
console.log(`Meeting in London: ${londonMeeting.toLocaleString('en-GB')}`);
console.log(`Meeting in New York: ${newYorkMeeting.toLocaleString('en-US')}`);

            

              
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// Suppose the sale ends at midnight UTC
const saleEndTimeUTC = Temporal.PlainDateTime.from('2024-03-01T00:00:00');
const userTimeZone = Temporal.TimeZone.from('America/Los_Angeles');
const saleEndTimeUserTime = saleEndTimeUTC.toZonedDateTime(userTimeZone);
console.log(`Sale ends at: ${saleEndTimeUserTime.toLocaleString('en-US', { timeZone: 'America/Los_Angeles' })}`);

            

              
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const transactionTime = Temporal.Now.zonedDateTime('UTC');
const transactionTimeInLocal = transactionTime.toZonedDateTime(Temporal.TimeZone.from('America/New_York'));
console.log(`Transaction time (UTC): ${transactionTime.toString()}`);
console.log(`Transaction time (New York): ${transactionTimeInLocal.toString()}`);

            

              
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// Example: Calculate the age of users
const birthDate = Temporal.PlainDate.from('1990-05-10');
const today = Temporal.Now.plainDateISO();
const age = birthDate.until(today).days / 365.25; // Approximate Age
console.log(`Approximate age: ${Math.floor(age)} years`);

            

              
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const eventTime = Temporal.Now.zonedDateTime('UTC');
console.log(`Event logged at: ${eventTime.toString()}`);

            

              
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npm install @js-temporal/polyfill

            

              
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import '@js-temporal/polyfill';
// Now you can use the Temporal API
const today = Temporal.Now.plainDateISO()
console.log(today.toString());

            

              
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