diff --git a/main.zig b/main.zig
index 89ea53222a3329293963b9aec7639537900f039a..01a825d15782969b38992fab576c72eb7c751d02 100644
--- a/main.zig
+++ b/main.zig
@@ -51,3 +51,5 @@ test { try assertOk(1144509852789, "YYY",  "2006"); }
 test { try assertOk(1144509852789, "YYYY",  "2006"); }
 test { try assertOk(1144509852789, "N",    "AD"); }
 test { try assertOk(1144509852789, "NN",   "Anno Domini"); }
+test { try assertOk(1144509852789, "A",    "PM"); }
+test { try assertOk(1144509852789, "a",    "pm"); }
diff --git a/time.zig b/time.zig
index e983e4c20124d90d166c6f2a94cc528737dc0cca..66dcb26fa2ed1b260df0d878ee4b8140b2f3657c 100644
--- a/time.zig
+++ b/time.zig
@@ -256,6 +256,8 @@ pub const DateTime = struct {
                     .YYY => try writer.print("{}", .{self.years}),
                     .N => try writer.writeAll(@tagName(self.era)),
                     .NN => try writer.writeAll("Anno Domini"),
+                    .A => try printLongName(writer, self.hours / 12, &[_]string{ "AM", "PM" }),
+                    .a => try printLongName(writer, self.hours / 12, &[_]string{ "am", "pm" }),
 
                     else => @compileError("'" ++ @tagName(tag) ++ "' not currently supported"),
                 }