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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

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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
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Wed Apr  1
Fri May  1
Mon Jun  1