There are a variety of ways to see how many records have the same date.
The simplest way is to create a new formula field that displays only the date, and then group the records on that field. The summary bar for each group will tell you the number of records with that date.
Here is a formula that will display the date that the record was created in a format that will sort cleanly:
DATESTR(CREATED_TIME())
To create a formula field for the week, so that you can group by week, use this formula to turn the date into a week number:
WEEKNUM(CREATED_TIME())
If you have a pro subscription, you can then use the Chart block with these formula fields to see graphs of the number of records per day or week.
If you would like additional calculations on the groups, you will need to create linked records for each date or week, depending on how you want to group the data. This is a more involved process, and depends on how you want to group your data and what calculations you want to perform.
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