如何将给定日期转换为America/Los_Angeles时区时间？

First, let's clarify the context: Your checkIn value "2021-08-30 03:45:00" is likely in UTC. Since August falls within Daylight Saving Time (DST) for America/Los_Angeles, the applicable timezone offset is UTC-7 (PDT).

The converted local time for America/Los_Angeles would be 2021-08-29 20:45:00 PDT.

If you need to implement this programmatically, here are practical examples in common languages:

Python Example #

Using the datetime and pytz libraries (install pytz first with pip install pytz):

from datetime import datetime
import pytz

# Parse the UTC check-in time
utc_time = datetime.strptime("2021-08-30 03:45:00", "%Y-%m-%d %H:%M:%S").replace(tzinfo=pytz.utc)

# Convert to America/Los_Angeles timezone
la_time = utc_time.astimezone(pytz.timezone("America/Los_Angeles"))

print(la_time.strftime("%Y-%m-%d %H:%M:%S %Z"))
# Output: 2021-08-29 20:45:00 PDT

JavaScript Example (Node.js/Browser) #

Using vanilla JavaScript's Intl.DateTimeFormat and Date object:

// Parse the UTC time string
const utcDate = new Date("2021-08-30T03:45:00Z");

// Format for America/Los_Angeles timezone
const laFormatter = new Intl.DateTimeFormat("en-US", {
  timeZone: "America/Los_Angeles",
  year: "numeric",
  month: "2-digit",
  day: "2-digit",
  hour: "2-digit",
  minute: "2-digit",
  second: "2-digit",
  timeZoneName: "short"
});

console.log(laFormatter.format(utcDate));
// Output: 08/29/2021, 08:45:00 PM PDT

Java Example #

Using Java 8+ java.time API:

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.ZoneId;

public class TimeConversion {
    public static void main(String[] args) {
        // Parse UTC time
        ZonedDateTime utcTime = ZonedDateTime.parse("2021-08-30T03:45:00Z");
        
        // Convert to America/Los_Angeles
        ZonedDateTime laTime = utcTime.withZoneSameInstant(ZoneId.of("America/Los_Angeles"));
        
        // Format the output
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss z");
        System.out.println(formatter.format(laTime));
        // Output: 2021-08-29 20:45:00 PDT
    }
}

All these examples automatically handle the DST adjustment for the given date, ensuring you get the accurate local time for America/Los_Angeles.

内容的提问来源于stack exchange，提问作者vims