A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
That is not actually a fraction, it is a decimal.
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You are in luck. Excel actually stores dates as a whole number series starting Jan1 1900. Year, month, day is implicit in that series. They are easy to extract in various ways
Excel stores times as decimal values on the date series number.
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So your value 4.62 translates to Jan 4, 1900 2:52 PM.
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Please explain how you are using this value. I'm guessing it is a duration from some start point that you want to convert to a future date/time.
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Here are some articles about how Excel handles dates/times
Excel Date and Time Formatting codes
https://www.myonlinetraininghub.com/excel-date-and-time-formatting
October 20, 2017 by Mynda Treacy
Even though dates and time are actually stored as a regular number known as the date serial number, we can make use of extensive Excel date and time formatting options to display them just the way we want.
We can access some quick date and time formats from the Home tab > in the Number group
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How to change date format in Excel and create custom formatting
https://www.ablebits.com/office-addins-blog/2015/03/11/change-date-format-excel/
by Svetlana Cheusheva | updated on November 2, 2021
The first part of our tutorial focuses of formatting dates in Excel and explains how to set the default date and time formats, how to change date format in Excel, how to create custom date formatting, and convert your dates to another locale.
Along with numbers, dates and times are the most common data types people use in Excel. However, they may be quite confusing to work with, firstly, because the same date can be displayed in Excel in a variety of ways, and secondly, because Excel always internally stores dates in the same format regardless of how you have formatted a date in a given cell.
Knowing the Excel date formats a little in depth can help you save a ton of your time. And this is exactly the aim of our comprehensive tutorial to working with dates in Excel. In the first part, we will be focusing on the following features: