set mtime to creation time for photos

set_mtime_to_creation.sh

#!/bin/bash
# set_mtime_to_creation.sh
# Sets each file's modification time to its creation time (macOS / BSD)

shopt -s nullglob

for file in *; do
    # Skip directories
    if [ -d "$file" ]; then
        continue
    fi

    # Get creation time in epoch seconds
    birth=$(stat -f "%B" "$file" 2>/dev/null)

    # Skip if stat fails or returns 0
    if [ -z "$birth" ] || [ "$birth" -eq 0 ]; then
        echo "Skipping '$file' (no creation time)"
        continue
    fi

    # Convert to touch timestamp format
    touch_time=$(date -r "$birth" +"%Y%m%d%H%M.%S")

    # Apply creation time to modification time
    touch -mt "$touch_time" "$file"

    echo "Updated '$file' → mtime set to creation time ($touch_time)"
done

echo "✅ Done: All applicable files updated."