\documentclass[12 pt,a4 paper]{article}
\usepackage[top=1cm,left=1in,right=1 in,bottom=1in]{geometry}
\usepackage{times}
\usepackage{graphicx}
\usepackage{marvosym}
\usepackage[onehalfspacing]{setspace}
\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{fancyhdr}
\usepackage{xcolor}
\pagestyle{fancy}
\usepackage{multirow}
\fancyhf{}
\usepackage[ddmmyyyy]{datetime}
%\renewcommand{\footrulewidth}{2 pt}
%\lfoot{dept}
%\rfoot{\thepage}
\begin{document}
\section*{\centering{Personal Letterhead}}
\begin{tikzpicture}
[remember picture,overlay]
\draw[line width=3pt,rounded corners=20pt]
($(current page.north west) + (1 in,-1in) $) rectangle($ (current page.south east)+(-0.5 in,1 in) $);
\%begin{tikzpicture}[overlay,remember picture]
%\draw [line width=1mm,%decorate,%decoration={snake
% ,segment length=<length>,amplitude=<length>
%}
]
%($ (current page.north west) + (0.3cm,-0.3cm) $)
%rectangle
% ($ (current page.south east) + (-0.3cm,0.3cm) $);
\end{tikzpicture}
\pagestyle{empty}
\vspace{10 mm}
\begin{center}
\begin{tabular}{l l r}
\multirow{5}{*}{\includegraphics[width=0.17\linewidth]{logo.jpg}}&
\textbf{Gagan Deep Gupta} \\
& Student & \Mobilefone~+91-9588827141\\
& Department of CS & ~\Telefon~0141-2303608 \\
& SKIT &\FAX~+785748547878\\
&Jaipur,Rajasthan & \Email~gagandeepgupta520@gmail.com\\
\end{tabular}
\vskip2mm
\vspace{2mm}
{\color{red}\rule{\textwidth}{2.5pt}}
\end{center}
\hfill20/09/2019\\
\vskip5mm
%.............
Dear ....
%
\vfill
\begin{tabular}{l}
Sincerely Yours,\\
Author Name
\end{tabular}
\end{document}
