MSSQL中获得当前时间的简单方法

Getting the Current Time in MSSQL

With MSSQL, getting the current time is an essential aspect of managing time-based applications. As such, there have been numerous ways throughout the years to obtain the current time at any given point in time. We’ll explore the most simple, straightforward ways to get the current time in MSSQL here.

The simplest way to get the current time in MSSQL is by using the `GETDATE()` function. It is a powerful function that takes no arguments and will return the current time in the default time format set by the server. As a bonus, this will also automatically take into account any daylight saving time changes that occur.

If you want to consider a specific time zone (or offset from UTC) you can add the `AT TIME ZONE` syntax to the statement. For example, to obtain the current Eastern Standard Time (EST):

SELECT GETDATE() AT TIME ZONE 'Eastern Standard Time'

If you’re stuck in a situation where the `AT TIME ZONE` syntax is not available, you can alternatively make use of the `DATEPART()` function. It takes an argument specifying the unit of time to extract, such as minutes. By extracting the current minute for example, you can then determine the current time by calculating its offset from a reference point.

SELECT DATEPART(minute, GETDATE())
``` 

Finally, if you’re working with MSSQL server 2012 or newer, you can use the `SYSDATETIMEOFFSET()` function. It will return the current date and time with an offset to UTC. This could be useful if the server is located in a different time zone than the application. 

SELECT SYSDATETIMEOFFSET()

In conclusion, MSSQL provides a variety of ways to get the current time. Depending on what your application requires, you can choose between using the `GETDATE()` function, the `AT TIME ZONE` syntax, `DATEPART()` function, or the `SYSDATETIMEOFFSET()` function. Each of these has its own distinct and important features, so be sure to pick the right one for your application.

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