You can change the date format on a report, it just depends on the type of component.
For a slicer
To format the date:
- Select the component containing the date field. 
- Go into the Inspector window and select “Data Format”. 
- You can then choose a predefined format or create your own. 
To create your own:
- Scroll down to the Custom section and edit the format from the Type field. 
For Table and Chart Components
- Change the data field properties. 
- Select the component containing the date field. 
- Select the Exact Date. 
- Change the data field properties in Data Binding. 
- In Data Binding click on the cog and Edit the Format… 
Alternatively, you can also:
- Edit format. 
- Scroll down to Custom. 
- In Custom choose how the date is displayed, edit Type: field 
Change the date display
When adding Date fields (where available) from 1 per column i.e day - Month - Year to show in the same column as one entry.
- Select the component containing the date field. 
- Then, select the Exact Date. 
Examples of Date Formatting
| Day | Month | Year | 
| dd = 13 | mm = 11 | yy = 23 | 
| ddd = Mon | mmm = Nov | yyyy = 2023 | 
| dddd = Monday | mmm = November | 
 | 
| Format | Output Result | 
| dd mm yy | 13 11 23 | 
| ddd/mmm/yyyy | Mon/Nov/2023 | 
| dddd-mmm | Monday-November | 
PRO TIP: You can use any divider - Slash or dash ""/" "-" or none
e.g. dd-mm-yy - dd/mm/yyy - dd mm yy




