date-vars.sh


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: ${YEAR:=$(date +%Y)}
: ${DAY_OF_YEAR:=$(date +%j)}

: ${YEAR_YESTERDAY:=$YEAR}
: ${DAY_OF_YEAR_YESTERDAY:=$((10#$DAY_OF_YEAR - 1))}

if [ $((10#$DAY_OF_YEAR_YESTERDAY)) -eq 0 ]; then
    YEAR_YESTERDAY=$((YEAR - 1))
    DAY_OF_YEAR_YESTERDAY=001
fi