Hello all, My first arduino project is to make a data logger for analogue input. It consist of Mega, RTC, SD reader. This system make CSV files for excel. No problem. But, when I check the CSV files with the windows explorer, the file creation date and time has something wrong. See this screen …

Install the SdFat library - there is an example called Timestamp.ino describing in detail how to do it.. // after your rtc is set up and working you code just needs: void dateTime(uint16_t* date, uint16_t* time) { DateTime now = rtc.now(); // return date using FAT_DATE macro to format fields …

God only knows what a callback function is, but I bet you don't need to. The simplest solution is to name the file by date, or time, or both. An example of that is at http://homepages.ihug.com.au/~npyner/Arduino/Bluetooth_graphic_5110_with_file_retrieve_DY.ino Essentially, the clock is checked ev…

It isn't that simple because that's not what the OP asked for - and God isn't the only one who knows what a callback function is. The response from @BillHo is precisely what is required. I've just used it in a program of mine, after a bit of modification to use the information from a tm_elements st…

@donald0000 wants the Date Modified field to show an actual time stamp when you look at the files present on the card using Windows Explorer. As Billy Ho says, the callback function is the way to do it. You can indeed use this function with SD.h if you don't want to convert to SDFat. Here is an exam…

Thank you.. so much.. I'm now retrying it, according to your advice.. Hope you to have great day..

Nick_Pyner: God only knows what a callback function is ... I also know what a callback function is. Documented at Gammon Forum : Electronics : Microprocessors : Function pointers / function callbacks / function variables

Yes, but everybody knows that you are the Nick who sits at the right hand of God.......... Thanx

Nick... you trying to tell us something ? "God only knows what a callback function is ..".

What if I don't use an RTC in my project? Can I still change the date and time of the file created to the current date and time?

file creation date and time in sd card ?

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Nick_Pyner June 12, 2017, 2:37pm 11

If you have some other means of getting the date and time, there should be no problem at all.

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file creation date and time in sd card ?

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