diff --git a/src/Now.zig b/src/Now.zig
index 542554e..c603377 100644
--- a/src/Now.zig
+++ b/src/Now.zig
@@ -77,15 +77,9 @@ pub fn plainDateTimeISO(allocator: std.mem.Allocator, io: std.Io, time_zone_like
 ///
 /// See: [Temporal.Now.plainTimeISO](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Temporal/Now/plainTimeISO)
 pub fn plainTimeISO(allocator: std.mem.Allocator, io: std.Io, time_zone_like: ?[]const u8) !PlainTime {
-    const time_zone = try resolveTimeZone(allocator, io, time_zone_like);
-    const now = try instant(io);
-    defer now.deinit();
-
-    const ptr = (try abi.extractResult(abi.c.temporal_rs_PlainTime_from_epoch_nanoseconds(
-        abi.toI128Nanoseconds(now.epochNanoseconds()),
-        abi.to.toTimeZone(time_zone),
-    ))) orelse return abi.TemporalError.Generic;
-    return PlainTime{ ._inner = ptr };
+    const zdt = try zonedDateTimeISO(allocator, io, time_zone_like);
+    defer zdt.deinit();
+    return zdt.toPlainTime();
 }
 
 /// Returns a time zone identifier representing the system's current time zone.
diff --git a/src/PlainTime.zig b/src/PlainTime.zig
index 11a2c43..aa95109 100644
--- a/src/PlainTime.zig
+++ b/src/PlainTime.zig
@@ -45,14 +45,21 @@ pub fn init(
     microsecond_val: u16,
     nanosecond_val: u16,
 ) !PlainTime {
-    return wrapPlainTime(abi.c.temporal_rs_PlainTime_try_new(
+    if (hour_val > 23 or minute_val > 59 or second_val > 59 or
+        millisecond_val > 999 or microsecond_val > 999 or nanosecond_val > 999)
+    {
+        return abi.TemporalError.RangeError;
+    }
+    var buf: [18]u8 = undefined;
+    const s = std.fmt.bufPrint(&buf, "{d:0>2}:{d:0>2}:{d:0>2}.{d:0>3}{d:0>3}{d:0>3}", .{
         hour_val,
         minute_val,
         second_val,
         millisecond_val,
         microsecond_val,
         nanosecond_val,
-    ));
+    }) catch unreachable;
+    return from(s);
 }
 
 /// Parses a PlainTime from a string.