diff --git a/docs/cmdline-opts/gen.pl b/docs/cmdline-opts/gen.pl
index 8b9b98bb2d..edf90622b2 100755
--- a/docs/cmdline-opts/gen.pl
+++ b/docs/cmdline-opts/gen.pl
@@ -48,8 +48,14 @@ my %protolong;
 my %catlong;
 
 use POSIX qw(strftime);
-my $date = strftime "%B %d %Y", localtime;
-my $year = strftime "%Y", localtime;
+my @ts;
+if (defined($ENV{SOURCE_DATE_EPOCH})) {
+    @ts = localtime($ENV{SOURCE_DATE_EPOCH});
+} else {
+    @ts = localtime;
+}
+my $date = strftime "%B %d %Y", @ts;
+my $year = strftime "%Y", @ts;
 my $version = "unknown";
 my $globals;
 
diff --git a/docs/libcurl/mksymbolsmanpage.pl b/docs/libcurl/mksymbolsmanpage.pl
index a8cb10d82a..3bc6869491 100755
--- a/docs/libcurl/mksymbolsmanpage.pl
+++ b/docs/libcurl/mksymbolsmanpage.pl
@@ -26,8 +26,14 @@
 my $version="7.41.0";
 
 use POSIX qw(strftime);
-my $date = strftime "%b %e, %Y", localtime;
-my $year = strftime "%Y", localtime;
+my @ts;
+if (defined($ENV{SOURCE_DATE_EPOCH})) {
+    @ts = localtime($ENV{SOURCE_DATE_EPOCH});
+} else {
+    @ts = localtime;
+}
+my $date = strftime "%b %e, %Y", @ts;
+my $year = strftime "%Y", @ts;
 
 print <<HEADER
 .\\" **************************************************************************