How to Convert SQL Server 2008 DateTimeOffset to DateTime with Offset Adjustment?

Converting SQL Server 2008 DateTimeOffset to DateTime with Offset Adjustment

When working with databases, it may be necessary to convert data types to ensure compatibility or facilitate data analysis. One common conversion involves changing a DATETIMEOFFSET field to a DATETIME field while recalculating the time based on the specified offset. This guide provides the steps to accomplish this conversion effectively.

Conversion Process

The conversion from DATETIMEOFFSET to DATETIME involves the following procedures:

1. Use CONVERT Function: Use the CONVERT function to transform the DATETIMEOFFSET value to a DATETIME2 data type with style 1, which preserves the date and time while converting to UTC.

CONVERT(datetime2, @created_on, 1)

2. Convert Back to DATETIMEOFFSET: To retain the adjusted time in a DATETIMEOFFSET format, convert the DATETIME2 value back to DATETIMEOFFSET and specify an offset of 00:00.

CONVERT(datetimeoffset, CONVERT(datetime2, @created_on, 1))

Example Conversion

Let's consider the following DATETIMEOFFSET value:

@created_on = '2008-12-19 17:30:09.1234567 +11:00'

Converting this value to DATETIME using the CONVERT and CONVERT functions results in the following values:

CONVERT(datetime2, @created_on, 1) = '2008-12-19 06:30:09.12'
CONVERT(datetimeoffset, CONVERT(datetime2, @created_on, 1)) = '2008-12-19 06:30:09.1234567 +00:00'

As can be seen in the example, the conversion process recalculates the time by taking into account the offset ( 11:00) and converts the value to UTC ( 00:00).

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