d_offset.sh

#!/usr/bin/env ksh

echo $BASH_VERSION $KSH_VERSION ;date -R

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

#`datediff' offset ranges between -14h and +14h
#`datediff' iso8601 date offsets must be [+-]XX:XX
for date1 in         2024-02-28T{22,10,3}:{00,23}:{00,59}{+,-}{00,03,13}:{02,59} \
             1900-09-02T{1,12,23}:{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} \
         1988-03-01T{00,23}:{00,49,59}:{00,59}{+,-}{00,01,13}:{00,01,59}
    do
        ((TZ_COMP = ($RANDOM%61-30) % 15))
        ((TZ_COMP<0)) && TZ=UTC$TZ_COMP || TZ=UTC+$TZ_COMP
        {
            p=$(mainf "$date1" "$date2") || {   echo >&2 ;echo "TZ=$TZ $p" ;}
        } &
        printf '\033[2K%s | %s\t(%d) [%d] {%d}\r' "$date1" "$date2" $((++n)) $SECONDS $((n/(SECONDS+1))) >&2
    done


done

wait
echo >&2
echo N=$n >&2
#N=124416