1 files changed, 1 insertions, 1 deletions

diff --git a/coreutils/date.c b/coreutils/date.c
index 767e0d4a2..7965775fe 100644
--- a/coreutils/date.c
+++ b/coreutils/date.c
@@ -373,7 +373,7 @@ int date_main(int argc UNUSED_PARAM, char **argv)
                 date_buf[0] = '\0';
         } else {
                 /* Handle special conversions */
-                if (strncmp(fmt_dt2str, "%f", 2) == 0) {
+                if (is_prefixed_with(fmt_dt2str, "%f")) {
                         fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
                 }
                 /* Generate output string */