- y=$((m / 12)) m=$((m % 12)); [ $m -eq 0 ] && y=$((y - 1)) m=12;
- nstart="$(printf '%04i-%02i-%02i' "$y" "$m" "$d")"
- if isdate "$nstart" && [ $(date -d "$nstart" +%s) -ge $_DATE ]; then
+ # y=$(((m - 1) / 12)) m=$(((m - 1) % 12 + 1)); # [ $m -eq 0 ] && y=$((y - 1)) m=12;
+ nstart="$(printf '%04i-%02i-%02i' "$(( (m - 1) / 12 ))" "$(( (m - 1) % 12 + 1 ))" "$d")"
+ if isdate "$nstart" && [ "$(date -d "$nstart" +%s)" -ge "$_DATE" ]; then