read t m
y=1969
d=$t/86400
a=%02d
_[d-=m-2?m*9&8?31:30:y%4?28:29,m%=12,y+=!m++,d<0]
printf $[{_+y,m,d+31,t{/60{/60%24,},}%60}]"/$a/$a $a:$a:$a
";. *