diff --git a/revision.c b/revision.c
index 27cce090a1..28b5f2eace 100644
--- a/revision.c
+++ b/revision.c
@@ -1133,6 +1133,14 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 			if (!strncmp(arg, "--date=", 7)) {
 				if (!strcmp(arg + 7, "relative"))
 					revs->date_mode = DATE_RELATIVE;
+				else if (!strcmp(arg + 7, "iso8601") ||
+					 !strcmp(arg + 7, "iso"))
+					revs->date_mode = DATE_ISO8601;
+				else if (!strcmp(arg + 7, "rfc2822") ||
+					 !strcmp(arg + 7, "rfc"))
+					revs->date_mode = DATE_RFC2822;
+				else if (!strcmp(arg + 7, "short"))
+					revs->date_mode = DATE_SHORT;
 				else if (!strcmp(arg + 7, "local"))
 					revs->date_mode = DATE_LOCAL;
 				else if (!strcmp(arg + 7, "default"))