date -u -v+37S +%H:%M:%S|awk -F: '{printf":%06.2f\n",($1*3600+$2*60+$3)/86.4}'
#beattai #oneliner #BSD #freebsd

finally migrated #beatTAI to codeberg if you're interested in #weird #clocks; https://codeberg.org/B4UDW3RK5/beatTAI