d_offset_test.sh

#!/usr/bin/env bash

echo $BASH_VERSION ;date -R
export DEBUG=2  TZ=UTC-4

. ~/bin/datediff.sh -D || exit

#`datediff' offset ranges between -14h and +14h
#`datediff' iso8601 date offsets must be [+-]XX:XX
for date1 in         2022-02-02T22:{00,23}:{00,59}{+,-}{00,03,13}:{02,59}
do
    for date2 in 2022-02-02T{00,22}:{00,49,59}:{00,59}{+,-}{00,01,13}:{00,01,59}
    do
        #echo $((++n))
        {
            p=$(mainf "$date1" "$date2") || {   echo >&2 ;echo "$p" ;}
        } &
        printf '\033[2K%s | %s\t(%d) [%d] {%d}\r' "$date1" "$date2" $((++n)) $SECONDS $((n/(SECONDS+1))) >&2
    done


done
#wc:10368

wait
echo >&2
echo N=$n >&2