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JavaScriptでのDateの扱い

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Best Practices and Considerations

  1. Store in UTC, Display Locally: It's often recommended to store dates in UTC format and only convert to local time when displaying to users[5].

  2. Be Explicit About Timezones: When working with dates, always be clear about which timezone you're using to avoid confusion[5].

  3. Use ISO 8601 Format: When possible, use the ISO 8601 format (YYYY-MM-DDTHH:mm:ss.sssZ) for date strings, as it's unambiguous and includes timezone information[3].

  4. Be Aware of Browser Differences: Different browsers may handle certain date parsing operations differently, especially when the timezone isn't explicitly specified[4].

  5. Consider Libraries: For complex timezone operations, consider using libraries like Moment.js or date-fns, which provide more robust timezone handling capabilities[5].

Common Pitfalls

  1. Implicit Local Time: Be cautious when creating dates without specifying a timezone, as JavaScript may interpret them in the local timezone[3].

  2. Daylight Saving Time: Remember that daylight saving time can affect timezone offsets and calculations[4].

  3. Assuming Server Timezone: Don't assume the server's timezone matches the client's. Always be explicit about which timezone you're working in[5].

Citations:
[1] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/UTC
[2] https://www.geeksforgeeks.org/javascript-date-utc-method/
[3] https://www.ursahealth.com/new-insights/dates-and-timezones-in-javascript
[4] https://jaketrent.com/post/javascript-dates-utc/
[5] https://www.toptal.com/software/definitive-guide-to-datetime-manipulation
[6] https://www.fullstackfoundations.com/blog/javascript-dates