Datetime Formatting in onEdit()

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Oct 25, 2021, 10:23:08 AM10/25/21
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Hi Community,

I want to format datetime input value on onEdit event.

ex) 2021/10/25 15:00 -> Oct 25, 2021 3:00 PM

I put the same value (2021/10/25 15:00) on the sheet.

  1. When I get value by using SpreadsheetApp Class, it comes in with normal datetime value.

    SpreadsheetApp.getActiveSpreadsheet().getActiveSheet().getRange(6, 6).getValue()

    result : Oct 25 15:00:00 GMT+09:00 2021
  2. But when using event object on onEdit, it comes in Num type value.


    result : 44494.625

Is there any way to convert Number to Datetime?


Oct 26, 2021, 12:30:39 AM10/26/21
to Google Apps Script Community

I got the answer from Stack Overflow.

Using e.value cannot return Date data type, so it gets converted into Number.

You could use e.range.getValue() instead.

function onEdit(e) { 
   Logger.log(e.value);   //44494.625
   Logger.log(e.range.getValue());   //Oct 25 15:00:00 GMT+09:00 2021

Oct 26, 2021, 12:42:56 AM10/26/21



The value returned by e.value is not incorrect, it is just not formatted correctly to be seen as a Date.


You could use the following to set it up as a Date:


  Var dateValue = new Date(e.value);


The advantage of using the e params over using getValue() is that it is much faster as it does not require a poke at the spreadsheet. This is only of concern of course if you have a large amount of processing to be done and are concerned by how long the script takes to complete.


Hope this helps.

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Fred Richardson

Nov 26, 2022, 4:10:58 PM11/26/22
to Google Apps Script Community
Using Date(e.value) gave me some very strange values.  

To get a useable Date object out of the values stored in e.value and e.oldValue, I had to do the following conversion.  Google got me most of the way here and I was able to verify the conversion, but be aware of you time zone which you will have to account for when using "Date.UTC()":

Logger.log(d.value);     // The logged output is " 44725.0" --  this was "6/13/2022" in my Sheet
d = new Date(Date.UTC(1899, 11, 30, 4, 0, e.value * 86400));  // Date in days (converted to seconds) after Dec 30 00:00:00 GMT-04:00 1899
Logger.log(d);      // The logged output is "Mon Jun 13 00:00:00 GMT-04:00 2022" 
Logger.log(e.range.getValue());      // The logged output is also "Mon Jun 13 00:00:00 GMT-04:00 2022" 

So I think the number stored in e.value reflects my time zone (GMT-04:00), so I have to enter 4 hours into the UTC conversion above and I suspect that number would have to change for a different time zone,.


Fred Richardson

Nov 26, 2022, 7:18:13 PM11/26/22
to Google Apps Script Community
Well, I did find yet another wrinkle...  It looks like Daylight Time and Standard Time effect the number of seconds in e.value...

So I need to add a condition to figure out whether the offset needs to 4 hours (GMT-4 for EDT) or 5 hours (GMT-5 for EST).  *Sigh*...


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