diff --git a/devices/wasm/wasm/lib.c b/devices/wasm/wasm/lib.c
index a3f541e..00605ea 100644
--- a/devices/wasm/wasm/lib.c
+++ b/devices/wasm/wasm/lib.c
@@ -62,6 +62,11 @@ static void print_flush(bool is_error) {
   fprintf(is_error ? stderr : stdout, "\n");
 }
 
+/** Browser only: EV3/desktop use runner.c’s get_time_ms + clock_gettime. */
+static uint64_t wasm_get_time_ms(void) {
+  return (uint64_t)emscripten_get_now();
+}
+
 EMSCRIPTEN_KEEPALIVE
 void siwasm_alloc_heap(size_t size) {
   if (heap) {
@@ -93,6 +98,7 @@ void siwasm_run(unsigned char *code, size_t code_size) {
   sinter_printer_integer = print_integer;
   sinter_printer_string = print_string;
   sinter_printer_flush = print_flush;
+  sinter_get_time_ms = wasm_get_time_ms;
 
   sinter_value_t result;
   sinter_fault_t fault = (uint8_t) sinter_run(code, code_size, &result);
diff --git a/runner/src/runner.c b/runner/src/runner.c
index f5a94de..e3cbba1 100644
--- a/runner/src/runner.c
+++ b/runner/src/runner.c
@@ -1,3 +1,5 @@
+#define _POSIX_C_SOURCE 200809L
+
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -8,10 +10,17 @@
 #include <unistd.h>
 #include <errno.h>
 
+#include <time.h>
 #include <sinter.h>
 
 #define eprintf(...) fprintf(stderr, __VA_ARGS__)
 
+static uint64_t get_time_ms(void) {
+  struct timespec ts;
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return (uint64_t) ts.tv_sec * 1000u + (uint64_t) ts.tv_nsec / 1000000u;
+}
+
 static const char *fault_names[] = {
   "no fault",
   "out of memory",
@@ -94,9 +103,17 @@ int main(int argc, char *argv[]) {
   sinter_printer_string = print_string;
   sinter_printer_integer = print_integer;
   sinter_printer_flush = print_flush;
+  sinter_get_time_ms = get_time_ms;
 
   setup_internals();
 
+  void *heap = malloc(0x100000); // 1MB
+  if (!heap) {
+	eprintf("Failed to allocate heap\n");
+	return 1;
+  }
+  sinter_setup_heap(heap, 0x100000);
+
   sinter_value_t result = { 0 };
   sinter_fault_t fault = sinter_run(program, size, &result);
 
diff --git a/vm/include/sinter.h b/vm/include/sinter.h
index a5f145c..767d2be 100644
--- a/vm/include/sinter.h
+++ b/vm/include/sinter.h
@@ -105,6 +105,8 @@ extern sinter_printfn_integer sinter_printer_integer;
 extern sinter_printfn_float sinter_printer_float;
 extern sinter_printfn_flush sinter_printer_flush;
 
+extern uint64_t (*sinter_get_time_ms)(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/vm/src/primitives.c b/vm/src/primitives.c
index 5bbab9c..724fc58 100644
--- a/vm/src/primitives.c
+++ b/vm/src/primitives.c
@@ -5,6 +5,7 @@
 #include <string.h>
 #include <limits.h>
 #include <math.h>
+#include <errno.h>
 
 #include <sinter/nanbox.h>
 #include <sinter/fault.h>
@@ -1596,6 +1597,70 @@ static sinanbox_t sivmfn_prim_noop(uint8_t argc, sinanbox_t *argv) {
   return NANBOX_OFUNDEF();
 }
 
+uint64_t (*sinter_get_time_ms)(void) = NULL;
+
+static sinanbox_t sivmfn_prim_parse_int(uint8_t argc, sinanbox_t *argv) {
+  CHECK_ARGC(2);
+
+  if (!NANBOX_ISPTR(argv[0]) || !siheap_is_string(SIHEAP_NANBOXTOPTR(argv[0]))) {
+    sifault(sinter_fault_type);
+    return NANBOX_OFEMPTY();
+  }
+
+  int32_t radix = 0;
+  if (NANBOX_ISINT(argv[1])) {
+    radix = NANBOX_INT(argv[1]);
+  } else if (NANBOX_ISFLOAT(argv[1])) {
+    float fv = NANBOX_FLOAT(argv[1]);
+    if (!isfinite(fv) || truncf(fv) != fv) {
+      sifault(sinter_fault_type);
+      return NANBOX_OFEMPTY();
+    }
+    radix = (int32_t) fv;
+  } else {
+    sifault(sinter_fault_type);
+    return NANBOX_OFEMPTY();
+  }
+
+  if (radix < 2 || radix > 36) {
+    sifault(sinter_fault_type);
+    return NANBOX_OFEMPTY();
+  }
+
+  const char *str = sistrobj_tocharptr(SIHEAP_NANBOXTOPTR(argv[0]));
+  char *endptr = NULL;
+  errno = 0; 
+  long result = strtol(str, &endptr, radix);
+
+  if (endptr == str) {
+    return NANBOX_CANONICAL_NAN;
+  }
+
+  if (errno == ERANGE) {
+    // strtol overflowed, return as float instead
+    return NANBOX_OFFLOAT((float) result);
+  }
+
+  if (result >= NANBOX_INTMIN && result <= NANBOX_INTMAX) {
+    return NANBOX_OFINT((int32_t) result);
+  } else {
+    return NANBOX_OFFLOAT((float) result);
+  }
+}
+
+static sinanbox_t sivmfn_prim_runtime(uint8_t argc, sinanbox_t *argv) {
+  (void) argc; (void) argv;
+  if (sinter_get_time_ms) {
+    uint64_t t = sinter_get_time_ms();
+    if (t <= (uint64_t) NANBOX_INTMAX) {
+      return NANBOX_OFINT((int32_t) t);
+    }
+    return NANBOX_OFFLOAT((float) t);
+  }
+  return NANBOX_OFINT(0);
+}
+
+
 sivmfnptr_t sivmfn_primitives[] = {
   sivmfn_prim_accumulate,
   sivmfn_prim_append,
@@ -1666,11 +1731,11 @@ sivmfnptr_t sivmfn_primitives[] = {
   sivmfn_prim_math_trunc,
   sivmfn_prim_member,
   sivmfn_prim_pair,
-  /* parse_int */ sivmfn_prim_unimpl, // TODO: doesn't make sense without the ability to take input (prompt)
+  /* parse_int */ sivmfn_prim_parse_int,
   sivmfn_prim_remove,
   sivmfn_prim_remove_all,
   sivmfn_prim_reverse,
-  /* runtime */ sivmfn_prim_unimpl, // TODO: need to get time from host
+  /* runtime */ sivmfn_prim_runtime,
   sivmfn_prim_set_head,
   sivmfn_prim_set_tail,
   sivmfn_prim_stream,