DateTime vs. DateTimeOffset in .NET: When Should I Use Which?

DateTime and DateTimeoffset in .NET: When will it be used?

In the .NET, DateTime and DateTimeOffset were used to represent time, each useful. Datetime focuses on a specific calendar time, while DateTimeOffset has also captured the calendar time and local time zone offset.

datetime: Calendar time indicates

DateTime can be regarded as a specific location on the calendar. It may have labels, such as Local or UNSPECIFIED to indicate its relative perspective. DateTime is very useful when processing the time related to a specific location, such as capturing the current time of the user (e.g. Datetime.now). DateTimeOffset: The instantaneous time of the displacement amount

On the contrary, DateTimeOffset means "instant time". It refers to a common moment in time and has nothing to do with the time zone. This is similar to the time displayed on the digital clock. DateTimeOffset also captures this moment of moment and its offset with UTC, and uses "00:00" or "-04: 00" suffix.

Wise choice: instantaneous time and calendar time

DateTime and DateTimeOffset depends on the context. For a time compared to a specific location, use Datetime with a clear label (UNSPECIFIED, Local). However, when you need to be absolutely determined without being affected by local time, select DateTimeoffset or UTC DATETIME.

Processing conversion: Note .Kind

Please pay attention to the hidden conversion from DateTime to Datetimeoffset. It will explain the .Kind value carefully. If it is UTC, the offset is zero; otherwise, it is assumed that it is a local time. This may cause subtle problems when loading UNSPECIFIED DATETIME values ​​on a computer in different time zones.

Extreme explanation:

The comparison of

Datetimeoffset values ​​will be standardized to zero displacement before evaluation.

By verifying DateTimeOffset and .Offset respectively, complete unit testing is ensured.

Remember, the exponential form of DateTimeOffset storage time, but to determine the corresponding time in a specific time zone, other information may be required (for example, Timezoneinfo.id).

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