Selected Answer
Hi
You haven't attached an Excel file (the only type which can be added to a question or answer) or said (in your Profile) which version of Excel you are using but let's say you added a line chart....
To change the start date in recent versions of Excel, right click on the x axis (dates) and pick Format Axis... Make sure under Axis Type that Date in set. Then, under Bounds, change the Minimum from (International format) 04/01/2021 to 12/03/2021. You may need to change the Maximum and the Major units too for a neat Axis (but I can't see your data).
Likewise for the y-axis, right click that, pick Format Axis... then change Minumum from -200 to 0 etc.
Don't forget to mark this Answer as Selected if it solves your problem. Otherwise, please attach an Excel file (as I reqiested before).
Also, I suggest you follow the Excel Tutorials hyperlink above and look in the section Charts and Graphs in Excel to find out more about this subject.