If you cannot be assured that the time-of-day will be ignored, choose 12:00 Noon, rather than 00:00 Midnight as a more safe representative time on that day. If such a type is not available, be sure to always ignore the time-of-day when interpreting the value.When possible, store in a date-only data type that does not include a time of day.When storing whole dates, such as birthdays and anniversaries, do not convert to UTC or any other time zone.When scheduling future events, usually local time is preferred instead of UTC, as it is common for the offset to change.If you might later need to modify the timestamp, include the original time zone ID so you can determine if the offset may have changed from the original value recorded.This value should always be based on UTC, without any time zone adjustment. If you require higher precision, use milliseconds instead. When storing timestamps as a numeric value, use Unix time - which is the number of whole seconds since (excluding leap seconds).Often this is done with two separate fields, but some platforms support a datetimeoffset type that can store both in a single field. In some cases, you may need to store both the UTC time and the equivalent local time.If instead you choose to persist a (past) time using a local time value, include the local time offset for this particular time from UTC (this offset may change throughout the year), such that the timestamp can later be interpreted unambiguously.Notice that UTC is also known as Zulu or Z time.) (GMT and UTC are equivalent with this regard, but it is preferred to use the term UTC. Whenever you are referring to an exact moment in time, persist the time according to a unified standard that is not affected by daylight savings.Summary of answers and other data: (please add yours) General answers are great, but I would also like to see details especially if they are only available on one platform. I would be interested in programming, OS, data persistence and other pertinent aspects of the issue. What assumptions are part of your solution? (looking for context here).How have you dealt with the daylight saving issue?.How should the time of the order be persisted? There are of course an endless number of scenarios - this one is simply an illustrative one. Many systems are dependent on keeping accurate time, the problem is with changes to time due to daylight savings - moving the clock forward or backwards.įor instance, one has business rules in an order taking system that depend on the time of the order - if the clock changes, the rules might not be as clear.
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THANKS FOR READING will get a code emailed back to redeem on the App store for a free copy of Timecode.I am hoping to make this question and the answers to it the definitive guide to dealing with daylight saving time, in particular for dealing with the actual change overs. Unfortunately this blog post missed the sale that was running through NAB but the freebie codes are still good! The first 5 emails to DELETED AS ALL THE FREE CODES ARE GONE. The guys from Panoptik have been nice enough to provided us with 5 codes for a free copy of Timecode for Editblog readers. The history log can be emailed or SMSed for easy data transfer.
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