diff --git a/README.md b/README.md
index f5bfff5d6e0303b972cf138e683b1a0c9e05a8c8..bafeed3837a68b8d70fd0c840e8f6f72df515e37 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 ![loc](https://sloc.xyz/github/nektro/zig-time)
 [![license](https://img.shields.io/github/license/nektro/zig-time.svg)](https://github.com/nektro/zig-time/blob/master/LICENSE)
 [![nektro @ github sponsors](https://img.shields.io/badge/sponsors-nektro-purple?logo=github)](https://github.com/sponsors/nektro)
-[![Zig](https://img.shields.io/badge/Zig-0.15-f7a41d)](https://ziglang.org/)
+[![Zig](https://img.shields.io/badge/Zig-0.16-f7a41d)](https://ziglang.org/)
 [![Zigmod](https://img.shields.io/badge/Zigmod-latest-f7a41d)](https://github.com/nektro/zigmod)
 
 Exposes a `DateTime` structure that can be initialized and acted upon using various methods. All public methods return a new structure.
diff --git a/time.zig b/time.zig
index 7cfab48ecc5b12cb9a9eaa53b921eff0f4c6e6e9..e5f27db522dce1e991eb688b5b7dc9066e65d35d 100644
--- a/time.zig
+++ b/time.zig
@@ -250,9 +250,7 @@ pub const DateTime = struct {
     }
 
     /// fmt is based on https://momentjs.com/docs/#/displaying/format/
-    pub fn format(self: DateTime, comptime fmt: string, options: std.fmt.FormatOptions, writer: anytype) !void {
-        _ = options;
-
+    pub fn formatFmt(self: DateTime, comptime fmt: string, writer: anytype) !void {
         if (fmt.len == 0) @compileError("DateTime: format string can't be empty");
 
         @setEvalBranchQuota(100000);
@@ -358,10 +356,10 @@ pub const DateTime = struct {
     }
 
     pub fn formatAlloc(self: DateTime, alloc: std.mem.Allocator, comptime fmt: string) !string {
-        var list = std.array_list.Managed(u8).init(alloc);
+        var list = std.Io.Writer.Allocating.init(alloc);
         defer list.deinit();
 
-        try self.format(fmt, .{}, list.writer());
+        try self.formatFmt(fmt, &list.writer);
         return list.toOwnedSlice();
     }