Get KML of Google Maps Timeline for a date range

google-timeline-download.sh

#!/bin/bash
set -e -u -o pipefail

# Usage: Export a cookies.txt file from a browser logged-in in timeline.google.com with some
#   add-on/extension (i.e. Export cookies, Get cookies.txt). Now run the script for the
#   desired period:
#
#    $ bash google-timeline-download.sh cookies.txt 2022-01-01 2022-02-20 out.kml
#
# Dependencies: curl, perl-xml-twig.
#
# There exist free online sites tht render KML files into a map. For example: https://kmlviewer.nsspot.net

debug() {
  echo "$@" >&2
}

date_range() {
  local from=$1 to=$2
  local days=$((($(date '+%s' -d "$to") - $(date '+%s' -d "$from")) / (60 * 60 * 24)))

  seq 0 $days | while read days_offset; do
    date -d "$from + $days_offset days" "+%Y-%m-%d"
  done
}

download_kml_files() {
  local cookies=$1 from=$2 to=$3

  date_range "$from" "$to" | while IFS="-" read year month day; do
    local month0=$((10#$month - 1)) # 0-index month
    local day0=$((10#$day))         # The day arguments must not contain leading zeros
    local pb_ary=(
      "!1m8"
      "!1m3"
      "!1i$year!2i$month0!3i$day0"
      "!2m3"
      "!1i$year!2i$month0!3i$day0"
    )
    local pb=$(echo "${pb_ary[@]}" | tr -d " ")
    local url="https://timeline.google.com/maps/timeline/kml?authuser=0&pb=${pb}"
    local kmlfile="$year-$month-$day.kml"

    debug "GET $url -> $kmlfile"
    download_kml "$cookies" "$url" >"$kmlfile"
    echo "$kmlfile"
  done
}

download_kml() {
  local cookies=$1 url=$2
  local output
  output=$(curl -f -sS -L -b "$cookies" "$url")

  if grep -q "accounts.google.com/v3/signin" <<<"$output"; then
    debug "Authentication error. Check the cookies file: $cookies"
    return 1
  else
    echo "$output"
  fi
}

merge_kmls() {
  xargs -r xml_grep --wrap "Document" --cond "Placemark"
}

main() {
  if test $# -ne 4; then
    echo "Usage: $(basename "$0") COOKIES.txt FROM(YYYY-MM-DD) TO(YYYY-MM-DD) OUT.kml"
    exit 2
  else
    local outfile=$4
    download_kml_files "$@" | merge_kmls >"$outfile"
  fi
}

main "$@"

lol! Cant download anything after july, as the month above 07 causes "line 37: 08: value too great for base (error token is "08")". It is interpreted as octal number.
adding line before the error line solves it: local month0=$(($((10#$month)) - 1))

@disconnect5852 Thanks for the report! Fixed. Also, added a 4th argument for the output KML file, and a check on the session.

Should this still work? cant get any usefull responses