write a plot that is zoomed into a graph which has x-values as dates in matlab

The best way to plot dates on the x-axis in MATLAB is to use the datenum function. Here's an example code for plotting dates on x-axis and zooming in to a portion of the graph:

main.m
% Generate sample data
start_date = datetime('01-Jan-2021');
end_date = datetime('31-Jan-2021');
dates = start_date:end_date;
data = rand(size(dates));

% Plot the graph with dates on x-axis
plot(dates, data);

% Add x-axis label
xlabel('Date');

% Set the datetick format for x-axis
datetick('x','dd/mmm','keepticks');

% Zoom into a specific date range (e.g. 7th Jan to 21st Jan)
zoom xon;
xlim([datenum('07-Jan-2021') datenum('21-Jan-2021')]);
447 chars
19 lines

In this code, we first generate some sample data with datetime values for x-axis and some random data for y-axis. Then we plot the graph using plot function. We set the x-axis label using xlabel function and use datetick function to set the format of x-axis label to 'dd/mmm'. Finally, we use zoom function to enable zooming and use xlim function to set the x-axis limits to the desired date range.

Note that xlim function uses datenum to convert the date strings into numbers that can be used for setting the x-axis limits.