Functions Not Applying to Entire Dataset

[ahmadnawaz222]

I wanted to get the date from a column that has both date and time. I applied the function and it worked but i think the function is not applying to the entire dataset because there are some records where i am not getting data rather i am getting an NA value.
I used the following lines of code

`all_trips$Date <- format(as.Date(all_trips$started_at, format = "%d/%m/%Y"), "%Y-%m-%d")

all_trips$Month <- format(as.Date(all_trips$Date),format = "%B")

all_trips$Day <- format(as.Date(all_trips$Date),format = "%A")

all_trips$Year <- format(as.Date(all_trips$Date),format = "%Y")`

And the code worked. Now if you look at the "started_at" column then the date and time both are available in that column but the date is not showing in the columns which i have circled in red color at the bottom.
What is the problem here? And how can i correct this problem?
Thank you.

[andresrcs]

@ahmadnawaz222

`all_trips$Date <- format(as.Date(all_trips$started_at, format = "%d/%m/%Y"), "%Y-%m-%d")

In the screenshot you are showing started_at is in the ISO format YMD HMS not "%d/%m/%Y" that is why you get NAs because it can't parse the dates with the wrong format.

If you need more specific help, please provide a proper REPRoducible EXample (reprex) illustrating your issue.

[ahmadnawaz222]

But this problem is not appearing in the entire dataset. For example if i do the head(all_trips) then it shows the values which i am expecting. I am attaching the screenshot below.

[andresrcs]

Well, that means you have two date formats in your data, you should have normalized date formats before joining the datasets. This has nothing to do with a function not being applied to the entire data set but to the way you are processing your raw data.

I think it would be simpler to just reprocess your raw data files to make sure they all have the correct date format.

[ahmadnawaz222]

Basically, my data is in 4 separate excel files and i combined all of them together to create one final file all_tripsand i did a lot of data manipulation before binding all files together and just now i checked data type of started_at column of all separate excel files and each started_at column in all 4 excel files have the same data type which is "char"

What should i do now ? Can you recommend me anything?

[andresrcs]

Convert the started_at column in each dataframe to date type before combining them. Use a suitable date format for each case, some files are already in ISO format but some are not.