diff --git a/time.zig b/time.zig
index 6bb457ca89fd0960126b9a64f10a8ce14bcf6387..7509a48917b06a57c5ec1e25aaa788b7bc1b4a53 100644
--- a/time.zig
+++ b/time.zig
@@ -196,7 +196,7 @@ pub const DateTime = struct {
                     .HH => try writer.print("{:0>2}", .{self.hours}),
                     .mm => try writer.print("{:0>2}", .{self.minutes}),
                     .ss => try writer.print("{:0>2}", .{self.seconds}),
-                    .MM => try writer.print("{:0>2}", .{self.months}),
+                    .MM => try writer.print("{:0>2}", .{self.months + 1}),
                     .z => try writer.writeAll(@tagName(self.timezone)),
 
                     .MMM => {