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perl -e "while($ARGV[0]<=$ARGV[1]){$t=scalar localtime($ARGV[0]);print + $t.$/ if $t=~/\s1\s/;$ARGV[0]+=86400}" 1580500427 1591220427 ... Wed Apr 1 21:53:47 2020 Fri May 1 21:53:47 2020 Mon Jun 1 21:53:47 2020
perl -e "$t=shift;while($t<=$ARGV[0]){print gmtime($t)=~/(.*\w 1)/?$1 +.$/:'';$t+=86400}" # or ... Wed Apr 1 Fri May 1 Mon Jun 1