Add %x support to strftime

src/header/time/strftime.rs

@@ -230,6 +230,12 @@ pub unsafe fn strftime<W: WriteByte>(w: &mut W, format: *const c_char, t: *const
                     (unsafe { (*t).tm_yday } + 7 - (unsafe { (*t).tm_wday } + 6) % 7) / 7
                 ),
 
+                // US format date: %m/%d/%y.
+                b'x' => w!(recurse "%m/%d/%y"),
+
+                // US format time: %H:%M:%S
+                b'X' => w!(recurse "%T"),
+
                 // Last two digits of year: %y
                 b'y' => w!("{:02}", unsafe { (*t).tm_year } % 100),
 

tests/time/strftime.c

@@ -105,6 +105,12 @@ void strftime_mix(void) {
 
     strftime(buf, BUFS, "%T", &t);
     assert(strcmp(buf, "23:59:59") == 0);
+
+    strftime(buf, BUFS, "%x", &t);
+    assert(strcmp(buf, "12/31/20") == 0);
+
+    strftime(buf, BUFS, "%X", &t);
+    assert(strcmp(buf, "23:59:59") == 0);
 }
 
 void test_v(void) {