JSFiddle - React, Tailwind, and code Playground

HTML

<div class="datebox">    
    <span class="year">2009</span>
</div>

CSS

.datebox
{
    float: left;
    border: 1px solid #000000;
    position: relative;
    margin: 0px;
    width:100px;
    height:100px;
}

.year
{
    display: block;
    writing-mode: tb-rl;
    -webkit-transform: rotate(270deg);    
    -moz-transform: rotate(270deg);
    -ms-transform: rotate(270deg);
    -o-transform: rotate(270deg);
    transform: rotate(270deg);
    font-size: 24px;
    
    position: absolute;
    right: 0;
    bottom: 0;
    
    border: 1px solid #000000;
    
}