I hope this makes sense. Thanks!!

Actually, you can use autofill to drag the date/times down as required. Rather than using separate date/time columns, use a single date-time column. With a few examples it will drag appropriately.
If you need a year or more of data generated, you can use PowerQuery to generate a "Date Table" for you
2019 05 11 Creating a simple date table in DAX 2019 05 11
https://www.sqlbi.com/articles/creating-a-simple-date-table-in-dax/
This article shows how to build a basic date table using a calculated table and DAX.
A date table is required for most time intelligence calculations such as year-to-date, previous year or moving averages. If a data model does not already have a date table, it is possible to create one using a calculated table and some basic DAX code.
The date table needs to follow a few rules:
All the dates – from the first to the last day of each year – need to be present.
Each date gets its own row.
There are no holes allowed, even if a date is not referenced by an event.
The table needs to include one DateTime type column.
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2011 12 01 Using Query Editor to Create a Time Table
2011 12 01
https://PowerPivotpro.com/2011/12/using-query-editor-to-create-a-time-table/
The first thing I ever do when I create a new PowerPivot workbook is create the date tables that I need.
You can now create your own – from PowerPivot! In this post, there’s some SQL scripts that create time tables and you can simply cut and paste them into the query editor and use them straight away.
AND there’s one more bonus, especially for Accountants, you can set this up for YOUR Fiscal Year!
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2011 11 15 The Ultimate Date Table
I get a lot of questions from people who are struggling with the time intelligence functions in DAX.
And nine times out of ten, the answer is that they don’t have a proper date table.
I know it’s tempting. You’ve got your sales table, and hey, there’s a Date column in there!
So you use it, and pass that column as a parameter to, say, DATESBETWEEN, or DATEADD.
Sometimes that will give you an error. And other times, it won’t…
but the results will be funky. You need a separate Dates table, or perhaps you prefer to call it a Calendar table.
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2014 02 27 The Ultimate Date Table–Revisited
by Dominik Petri, Today he shares a cool “hybrid” technique that blends two of my favorites things – Data Market and Power Query!
As you might already know from Rob’s “The Ultimate Date Table” post, you need a separate calendar table to unleash the power of PowerPivot’s time intelligence functions. You want one for free? Fully customizable?
Running up to a variable end date? Updated automatically every time you open your workbook? The time has come…
Get a great calendar table – for free
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2010 05 01 Calling a Stored procedure in PowerPivot 2010 06 00https://PowerPivotpro.com/2010/06/calling-a-stored-procedure-in-PowerPivot/
While building a new PowerPivot workbook i wanted to use Time Intelligent functions. One of thegolden rules of PowerPivot time intelligent functionsis to create a seperate related time table. I have created a stored procedure which creates a new table in PowerPivot. You can use this code to create the range.
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