correlation of 2 signals

https://www.mathworks.com/matlabcentral/answers/664433-different-results-with-same-code#answer_557433

need little help.

i am actually correlating two signals. i want to circ shift the signal by (-1.9282e-12) and then find this delay by delay command.

code:
% t=linspace(0,1000,100001)  %in ms
xs=randn(1,100001)
grid on

subplot(3,1,1)
plot(t,xs)
title('SIGNAL RECEIVED AT MASTER')

shift_ms = 10;
%SIGNAL RECEIVED AT RECEIVER 1(TIME DELAYING THE DISCRETE SIGNAL)
x1=circshift(xs,shift_ms*.1); %signal received at receiver 1
subplot(3,1,2)
plot(t,x1)
title('SIGNAL RECEIVED AT RECEIVER#1')

[c,lags]=xcorr(xs,x1);
subplot(3,1,3)
plot(lags,c)
title('CORRELATION OF RECEIVER 1 AND PROCESSING UNIT')
[maxval indx]=max(c)

shiftCalc_ms = (length(t)-indx)/10
t21 = finddelay(xs,x1)

output: