This could be quite easy but its a helpful tweak to add a Date display to your blogger blog. It would show the current day of the year.

How to add Date in Blogger

– Log in to your blogger account, click on Design >> Edit HTML

– Tick the “Expand Widget Templates” checkbox.

– Find this tag by using Ctrl+F </head>

– Paste the code found below before the </head> tag.

<script src='http://4444444444r.googlepages.com/current-date.js' type='text/javascript'/>

– Now Go to Design >> Page Element, Click on Add Gadget and select ‘HTML/Javascript’

– Paste the below code.
<script>showCurrentDate();</script>

– Save it, preview your blog and see the days date.