[SOLVED] Append a custom date to file name that increases by one second

Issue

So, I generated like thousands of images that I need to rename with this format:

19-10-2022 17-35-10 (HH:MM:SS format)

And the next one should be:

19-10-2022 17-35-11 (increases by one second) and so on.

Also, my images are perfectly numbered (like 1.png, 2.png, 3.png and so on)

Is there any way to archieve this with a bash script or something? I would like to specify the starting date as well.

Edit: I have already searched for this question all over internet and I couldn't find any useful information. All I find is how to append regular dates and not a custom one that increases by one second like I am asking here.

Edit 2: I need it to be a different starting date than "now".

Solution

Convert starting date to number of seconds since epoch, then add number from file name (or do any other arithmetics):

#!/bin/bash

START=$(date +"%s" -d "2022-10-20 13:00")

for F in *.png; do
    N="${F%.png}"
    DATE=$(date +"%d-%m-%Y %H-%M-%S" -d@$((${START}+${N})))
    mv -v "${F}" "${DATE}.png"
done

UPD: this will work with perfectly named files but will fail on non-numerical names. Also it rename several files to the same name if you have something like 7.png, 07.png, 007.png. If you want to handle any file names, just discard original name and increase START by 1 for each rename.

Answered By - dimich

Answer Checked By - Candace Johnson (WPSolving Volunteer)