How is the time shift calculated when archiving emails?

How is the time shift calculated when archiving emails?

This article has been machine translated. If you find any errors, we would be grateful if you could report them to translation@timesensor.com.

General

This article explains why the time of archiving an email can have an impact on the imported sending time.


Background

E-mails are text messages which, among other things, also contain the time at which the message was sent. This information is always given with the deviation from the coordinated universal time (UTC). When importing an e-mail into time Sensor LEGAL, the e-mail is broken down into its components. The time of transmission in the e-mail is also read out. For example, the following information can be found in an e-mail:
Date: Fri, 29 Oct 2021 10:17:39 -0800

This information shows that the email was sent on 29.10.21 at 10:17:39 local time. On 29.10.21, the time zone PST was in daylight saving time with a deviation of -7 hours from the coordinated universal time UTC. For this reason, the evaluation of the above timestamp on 29.10.21 results in
Date: Fri, 29 Oct 2021 17:17:39 -0000
At the same time, Western Europe was also in daylight saving time, with a deviation of +2 hours from the coordinated universal time UTC. For this reason, when importing into timeSensor LEGAL on 29.10., the dispatch time is calculated as follows:
Date: Fri, 29 Oct 2021 19:17:39 +0100
If, on the other hand, the same email is imported on 05.11.21, the situation is different. Daylight saving time has ended in Western Europe, while the USA is still in daylight saving time (until 07.11.21). The deviation is now -8 hours compared to the coordinated universal time UTC. The evaluation of the time stamp at the end of November thus still results in
Date: Fri, 29 Oct 2021 17:17:39 -0000
Since daylight saving time has ended in Western Europe, the deviation from the coordinated universal time UTC is now +1 hour. For this reason, when importing into timeSensor LEGAL on 29.10., the dispatch time is calculated as follows:
Date: Fri, 29 Oct 2021 18:17:39 +0100
Daylight saving time also ended in the USA on 7.11.21. The evaluation of the time stamp now shows:
Date: Fri, 29 Oct 2021 18:17:39 -0000
In Western Europe, the deviation from the coordinated world time UTC is still +1 hour. For this reason, when importing into timeSensor LEGAL as of 7.11., the time of dispatch will be calculated as follows:
Date: Fri, 29 Oct 2021 19:17:39 +0100

Since the time conversion when archiving the e-mail is based on the current date (and not on the historical date of sending), time shifts of 1-2 hours may occur when archiving. It is therefore advantageous to archive e-mails promptly.


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