Batch Convert BMP to PNG & keep original created/modified dates

Question

I have many screenshots from video games over the years that I want to convert while maintaining their timestamps so I can keep them chronologically organized with other images.

I've already used an image converter, but it resets their date attributes.

Answer 1

The batch conversion function of IrfanView has an advanced option to keep date and time.

• Use File/Batch Conversion.
• Select the pictures you would like to convert.
• Mark 'use advanced options'.
  There is a button ' Advanced', which will open a window with the converting options.
• Under MISCELLANEOUS use the option 'Save files with original date/time'.

Answer 2

This powershell script might do the job:

#copy timestamp from files in folder A to files in folder B.

#user file folders (default assumes powershell script is in parent folder of both A and B)
$A = ".\bmp" #source
$B = ".\png" #target

$count = 0
$B_content = ls $B

foreach($file in ls $A){
    $otherfile = $B_content[$count]
    $otherfile.LastWriteTime=$file.LastWriteTime;
    $count++
}