![]() Check out my Patreon or YouTube Membership for more info. The time was set forward one hour from 03:00AM to 04:00AM local time. Sunday MaLatest change: Summer time started Switched to UTC +3 / Eastern European Summer Time (EEST). Join!ĭeveloper-level members of my YouTube channel or Patreon get access to a private Discord server to chat with other developers about Software Architecture and Design and access to source code for any working demo application I post on my blog or YouTube. The IANA time zone identifier for Sofia is Europe/Sofia. And if there ever is a change to any rules, you can update the UTC date/times. And for querying purposes, you’ll want to convert to UTC. If you need to store date/time in the future, then you want to record the time zone name and the version of the tzdb. While the standard advice of “just store UTC” can work, it will only work if you’re storing date/time that is in the past. We can query our database looking for future date/times where the tzdb is an older version and then redo the conversion of the dateTimeLocal using the IANA name to convert back to the correct UTC and update that value in our database. Site administrators can set a different time zone. When rules change, the time zone database will get updated. The default time zone for extract-based data sources in a site is Coordinated Universal Time (UTC). Daylight Saving Time rules can also change. Time zones & Daylight Saving TimeĪ date/time in the future, converted to UTC as of right now, might change. And that’s where the most significant problem lies, date/times in the future. The second reason I think this is standard advice is that people are only thinking about date/times that are in the past. You won’t need any conversion at runtime to do any sorting and filtering. This allows you to sort, filter, etc., all on a standardized date/time. The first is because you’re standardizing your date/times in your database, which means you can query your data and compare it against the UTC. ![]() There are two reasons why I think this is the standard advice given on storing date/times. Then when we need to return data to the client, we fetch it out of the database, which is in UTC, and send that UTC date/time to the client, where it can then convert it to its local date/time. Your app would then convert this to UTC, which would be This is their local date time with their current time zone offset. This date/time in ISO format would be sent to your Server/API as T18:00:00-400. They would be specifying it in their local time. As users enter data into your system, you might convert their specific local date time to UTC and then save that in your database.įor example, say you have a web application where the user must enter a date/time value. ![]() You’ll hear/read pretty standard advice to store all dates/times as UTC when storing dates/times in a database. Video can’t be loaded because JavaScript is disabled: Just store UTC? Handling Time Zones & Daylight Saving ()
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