How to Convert number to date with Forumla

[Jacob_Lee]

I have lots of dates that are setup as numbers in my excel sheet that I am bringing into airtable. I need to change the formatting of the dates while leaving them as numbers in the original column.

Example. 20170112 YYYYDDMM I need it converted to 12-01-2017 MM-DD-YYYY

I usually convert it using the following excel formula:

=DATE(LEFT(CELL1,4),MID(CELL1,5,2),RIGHT(CELL1,2))

Thanks for any help you can provide.

[Andre_Zijlstra]

I first collect the Day-Month-Year in seperate fields, just for making it visual.
You start off with a number

It is not a date, and when you check that with a formula DATETIME_FORMAT(NR,‘MM-DD-YYYY’) you will get an error message.

So let’s just split the date into 3 parts, like you described yourself:

DAY(MID(NR,5,2))
MONTH(RIGHT(NR,2))
YEAR(LEFT(NR,4))

Now you can use CONCATENATE() to collect the 3 into a datestring:
CONCATENATE(Month,"-",Day,"-",Year)

And then use the formula DATETIME_FORMAT(DateComp,‘MM-DD-YYYY’) to actually create a datefield

When you check the date now, for example with finding the WEEKDAY(Date) it will actually show you the weekday.

You have a date!

[Jacob_Lee]

Thank You That worked for me.

[Andy_Lin1]

An alternate method is to use the function DATETIME_PARSE
In your case, you’d put:
DATETIME_PARSE(NR,'YYYYDDMM')
Which will give you the date, formatted by default as M/D/YYYY h:mm a according to the documentation.

[Andre_Zijlstra]

Good you mention that.
Combining PARSE + FORMAT would be:
DATETIME_FORMAT(DATETIME_PARSE(NR,‘YYYYDDMM’),‘MM-DD-YYYY’)

I never used PARSE a lote, but it really is useful!
Thx