Question: on SSRS report I need to show `todays date and current time` 

i tried this `=FormatDateTime(Now,"MM/dd/yyyy hh:mm tt")` but this is not working for me giving an error.

Anyone please help me for `expression` ?

I want output display like `4/12/2013 12:05 PM`

Answer: 
The following is how I do it using Visual Studio 2017 for an RDL targetted for SSRS 2017:

Right-click on the field in the textbox on the design surface and choose **Placeholder Properties**. Choose the **Number** panel and click on **Date** in the **Category** listbox, then select the formatting you are looking for in the **Type** listbox.
First go to your control panel , select Date , time and Number Format . Now select English(United Kingdom) from the drop down list. 

Make sure the shor date field is equal to 'dd/mm/yyyy'. Press Apply. Now go to SSRS and right click on the report in the empty space and select properties.

If you are using visual studio then set Language property equal to =User!Language. 

If you are using Report Builder then Language property will appear in Localization section.