In MongoDB, you can use the $convert aggregation pipeline operator to convert a value to a specified type.
You can convert any valid expression to a double, string, ObjectId, boolean, Date, integer, long, or decimal.
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Converting Between Date & Time Data Types in SQL Server (T-SQL Examples)
When you convert between date and time data types in SQL Server, you need to be mindful of how the new data type will handle the value you’re trying to assign to it.
In some cases you might lose part of the value, in other cases you might gain a bunch of zeros (increasing storage size in the process). You may also end up with a value that’s been rounded up.
The following articles contain examples of conversions between the different date and time data types, with a particular focus on the issues I just mentioned.
Convert ‘datetimeoffset’ to ‘time’ in SQL Server (T-SQL Examples)
If you have a datetimeoffset value, but you don’t need the date and time zone offset part, converting it to time will save you a lot of storage space (while removing unnecessary details from the value). This article contains examples of converting a datetimeoffset value to a time value in SQL Server.
Convert ‘datetimeoffset’ to ‘date’ in SQL Server (T-SQL Examples)
If you have a datetimeoffset value, but you don’t need the time and time zone offset part, converting it to date will save you a lot of storage space (while removing unnecessary details from the value). This article contains examples of converting a datetimeoffset value to a date value in SQL Server.
Convert ‘datetimeoffset’ to ‘smalldatetime’ in SQL Server (T-SQL Examples)
This article contains examples of converting a datetimeoffset value to smalldatetime in SQL Server.
When you convert a datetimeoffset value to smalldatetime, the date and hours are copied. The minutes are rounded up (depending on the seconds value) and the seconds are set to 0.
Convert ‘datetimeoffset’ to ‘datetime2’ in SQL Server (T-SQL Examples)
This article contains examples of converting a datetimeoffset value to datetime2 in SQL Server.
When you convert a datetimeoffset value to datetime2, the date and time are copied to the datetime2 value, and the time zone is truncated. The fractional seconds are also truncated to fit if the destination precision is lower.
Convert ‘datetimeoffset’ to ‘datetime’ in SQL Server (T-SQL Examples)
This article contains examples of converting a datetimeoffset value to datetime in SQL Server.
When you convert a datetimeoffset value to datetime, the date and time values are copied, and the time zone offset is truncated. When the fractional precision of the datetimeoffset value is greater than three digits, the value is truncated.
Convert ‘smalldatetime’ to ‘time’ in SQL Server (T-SQL Examples)
This article contains examples of converting a smalldatetime value to a time value in SQL Server.
When you convert a smalldatetime value to time, you lose the date. The hours, minutes, and seconds are copied. The fractional seconds are set to 0.
Convert ‘smalldatetime’ to ‘date’ in SQL Server (T-SQL Examples)
This article contains examples of converting a smalldatetime value to a date value in SQL Server.
One of the benefits of converting a smalldatetime value to date is that you reduce the storage size down from 4 bytes to 3 bytes. However, you do lose the time component from the value, so you would only do this conversion if you don’t need the time.
Convert ‘smalldatetime’ to ‘datetime’ in SQL Server (T-SQL Examples)
This article contains examples of converting a smalldatetime value to a datetime value in SQL Server.
The smalldatetime data type doesn’t have any fractional seconds, and its seconds component is always set to zero (:00). Its accuracy is to the nearest minute.
The datetime data type on the other hand, includes a 3-digit fractional seconds part, and its accuracy is rounded to increments of .000, .003, or .007 seconds.
When you convert a smalldatetime value to datetime, the smalldatetime value is copied to the datetime value. The fractional seconds are set to 0.
In most cases, you’d be better off converting to a datetime2 data type instead of a datetime. Doing this will provide increased accuracy, while using the same storage size. However, if you really do need it to be datetime, here are some examples.