chore: remove old date code

codegen/src/date.zig

@@ -1,53 +0,0 @@
-const std = @import("std");
-const zeit = @import("zeit");
-
-const DateFormat = enum {
-    rfc1123,
-    iso8601,
-};
-
-pub const Timestamp = enum(zeit.Nanoseconds) {
-    _,
-
-    pub fn jsonStringify(value: Timestamp, options: anytype, out_stream: anytype) !void {
-        _ = options;
-
-        const instant = try zeit.instant(.{
-            .source = .{
-                .unix_nano = @intFromEnum(value),
-            },
-        });
-
-        try out_stream.writeAll("\"");
-        try instant.time().gofmt(out_stream, "Mon, 02 Jan 2006 15:04:05 GMT");
-        try out_stream.writeAll("\"");
-    }
-
-    pub fn parse(val: []const u8) !Timestamp {
-        const date_format = blk: {
-            if (std.ascii.isDigit(val[0])) {
-                break :blk DateFormat.iso8601;
-            } else {
-                break :blk DateFormat.rfc1123;
-            }
-        };
-
-        const ins = try zeit.instant(.{
-            .source = switch (date_format) {
-                DateFormat.iso8601 => .{
-                    .iso8601 = val,
-                },
-                DateFormat.rfc1123 => .{
-                    .rfc1123 = val,
-                },
-            },
-        });
-
-        return @enumFromInt(ins.timestamp);
-    }
-};
-
-test Timestamp {
-    const http_date = try Timestamp.parse("Mon, 02 Jan 2006 15:04:05 GMT");
-    try std.testing.expectEqual(1136214245000, http_date);
-}