diff --git a/src/main.c b/src/main.c
index 08957bf..72173c6 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,3 +1,4 @@
+#define _XOPEN_SOURCE
 #include <assert.h>
 #include <ctype.h>
 #include <stdbool.h>
@@ -67,10 +68,22 @@ static void parse_preamble(struct parser *p) {
 	int section = -1;
 	uint32_t ch;
 	char date[256];
-	time_t now;
-	time(&now);
-	struct tm *now_tm = localtime(&now);
-	strftime(date, sizeof(date), "%F", now_tm);
+	char *source_date_epoch = getenv("SOURCE_DATE_EPOCH");
+	if (source_date_epoch != NULL) {
+		struct tm source_date_epoch_tm;
+		char *ret = strptime(source_date_epoch, "%s", &source_date_epoch_tm);
+		if (ret == NULL || *ret != '\0') {
+			fprintf(stderr,
+					"Error: $SOURCE_DATE_EPOCH is set but malformed.\n");
+			exit(1);
+		}
+		strftime(date, sizeof(date), "%F", &source_date_epoch_tm);
+	} else {
+		time_t now;
+		time(&now);
+		struct tm *now_tm = localtime(&now);
+		strftime(date, sizeof(date), "%F", now_tm);
+	}
 	while ((ch = parser_getch(p)) != UTF8_INVALID) {
 		if ((ch < 0x80 && isalnum(ch)) || ch == '_' || ch == '-' || ch == '.') {
 			int ret = str_append_ch(name, ch);
diff --git a/test/preamble b/test/preamble
index 03e2d0c..e46dc32 100755
--- a/test/preamble
+++ b/test/preamble
@@ -37,6 +37,9 @@ test(8)
 EOF
 end 0
 
+# Make sure SOURCE_DATE_EPOCH is not set for the next tests
+unset SOURCE_DATE_EPOCH
+
 begin "Writes the appropriate header"
 scdoc <<EOF | grep '^\.TH "test" "8" "'"$(date +'%F')"'"' >/dev/null
 test(8)
@@ -66,3 +69,11 @@ scdoc <<EOF | grep '^\.TH "test-manual" "8" "'"$(date +'%F')"'" "" "Header"' >/d
 test-manual(8) "" "Header"
 EOF
 end 0
+
+export SOURCE_DATE_EPOCH=$(date --date="2017-12-09 23:18:57 -0500" +'%s')
+
+begin "Supports \$SOURCE_DATE_EPOCH"
+scdoc <<EOF | grep '^\.TH "reproducible-manual" "8" "2017-12-10"' >/dev/null
+reproducible-manual(8)
+EOF
+end 0