diff --git a/include/sentry.h b/include/sentry.h
index 8b2c779db..33527222b 100644
--- a/include/sentry.h
+++ b/include/sentry.h
@@ -1736,6 +1736,14 @@ SENTRY_EXPERIMENTAL_API void sentry_transaction_context_update_from_header_n(
  */
 SENTRY_EXPERIMENTAL_API sentry_transaction_t *sentry_transaction_start(
     sentry_transaction_context_t *tx_cxt, sentry_value_t sampling_ctx);
+/**
+ * Also starts a transaction like the regular `sentry_transaction_start`
+ * function, but has an additional timestamp parameter to let the user provide
+ * explicit timings.
+ */
+SENTRY_EXPERIMENTAL_API sentry_transaction_t *sentry_transaction_start_ts(
+    sentry_transaction_context_t *tx_cxt, sentry_value_t sampling_ctx,
+    uint64_t timestamp);
 
 /**
  * Finishes and sends a Transaction to sentry. The event ID of the Transaction
@@ -1748,6 +1756,13 @@ SENTRY_EXPERIMENTAL_API sentry_transaction_t *sentry_transaction_start(
  */
 SENTRY_EXPERIMENTAL_API sentry_uuid_t sentry_transaction_finish(
     sentry_transaction_t *tx);
+/**
+ * Also finishes a transaction like the regular `sentry_transaction_finish`
+ * function, but has an additional timestamp parameter to let the user provide
+ * explicit timings.
+ */
+SENTRY_EXPERIMENTAL_API sentry_uuid_t sentry_transaction_finish_ts(
+    sentry_transaction_t *tx, uint64_t timestamp);
 
 /**
  * Sets the Transaction so any Events sent while the Transaction
@@ -1816,6 +1831,17 @@ SENTRY_EXPERIMENTAL_API sentry_span_t *sentry_transaction_start_child(
 SENTRY_EXPERIMENTAL_API sentry_span_t *sentry_transaction_start_child_n(
     sentry_transaction_t *parent, const char *operation, size_t operation_len,
     const char *description, size_t description_len);
+/**
+ * Also starts a span like the regular `sentry_transaction_start_child_ts`
+ * functions, but has an additional timestamp parameter to let the user provide
+ * explicit timings.
+ */
+SENTRY_EXPERIMENTAL_API sentry_span_t *sentry_transaction_start_child_ts(
+    sentry_transaction_t *parent, const char *operation,
+    const char *description, uint64_t timestamp);
+SENTRY_EXPERIMENTAL_API sentry_span_t *sentry_transaction_start_child_ts_n(
+    sentry_transaction_t *parent, const char *operation, size_t operation_len,
+    const char *description, size_t description_len, uint64_t timestamp);
 
 /**
  * Starts a new Span.
@@ -1852,6 +1878,17 @@ SENTRY_EXPERIMENTAL_API sentry_span_t *sentry_span_start_child(
 SENTRY_EXPERIMENTAL_API sentry_span_t *sentry_span_start_child_n(
     sentry_span_t *parent, const char *operation, size_t operation_len,
     const char *description, size_t description_len);
+/**
+ * Also starts a span like the regular `sentry_span_start_child_ts` functions,
+ * but has an additional timestamp parameter to let the user provide explicit
+ * timings.
+ */
+SENTRY_EXPERIMENTAL_API sentry_span_t *sentry_span_start_child_ts(
+    sentry_span_t *parent, const char *operation, const char *description,
+    uint64_t timestamp);
+SENTRY_EXPERIMENTAL_API sentry_span_t *sentry_span_start_child_ts_n(
+    sentry_span_t *parent, const char *operation, size_t operation_len,
+    const char *description, size_t description_len, uint64_t timestamp);
 
 /**
  * Finishes a Span.
@@ -1864,6 +1901,12 @@ SENTRY_EXPERIMENTAL_API sentry_span_t *sentry_span_start_child_n(
  * span.
  */
 SENTRY_EXPERIMENTAL_API void sentry_span_finish(sentry_span_t *span);
+/**
+ * Also finishes a span like the regular `sentry_span_finish` function, but has
+ * an additional timestamp parameter to let the user provide explicit timings.
+ */
+SENTRY_EXPERIMENTAL_API void sentry_span_finish_ts(
+    sentry_span_t *span, uint64_t timestamp);
 
 /**
  * Sets a tag on a Transaction to the given string value.
diff --git a/src/sentry_core.c b/src/sentry_core.c
index cedce7847..d89014bf9 100644
--- a/src/sentry_core.c
+++ b/src/sentry_core.c
@@ -840,8 +840,8 @@ sentry_set_level(sentry_level_t level)
 }
 
 sentry_transaction_t *
-sentry_transaction_start(
-    sentry_transaction_context_t *opaque_tx_cxt, sentry_value_t sampling_ctx)
+sentry__transaction_start(sentry_transaction_context_t *opaque_tx_cxt,
+    sentry_value_t sampling_ctx, uint64_t timestamp)
 {
     // Just free this immediately until we implement proper support for
     // traces_sampler.
@@ -874,14 +874,29 @@ sentry_transaction_start(
 
     sentry_value_set_by_key(tx, "start_timestamp",
         sentry__value_new_string_owned(
-            sentry__usec_time_to_iso8601(sentry__usec_time())));
+            sentry__usec_time_to_iso8601(timestamp)));
 
     sentry__transaction_context_free(opaque_tx_cxt);
     return sentry__transaction_new(tx);
 }
 
+sentry_transaction_t *
+sentry_transaction_start(
+    sentry_transaction_context_t *opaque_tx_cxt, sentry_value_t sampling_ctx)
+{
+    return sentry__transaction_start(
+        opaque_tx_cxt, sampling_ctx, sentry__usec_time());
+}
+
+sentry_transaction_t *
+sentry_transaction_start_ts(sentry_transaction_context_t *opaque_tx_cxt,
+    sentry_value_t sampling_ctx, uint64_t timestamp)
+{
+    return sentry__transaction_start(opaque_tx_cxt, sampling_ctx, timestamp);
+}
+
 sentry_uuid_t
-sentry_transaction_finish(sentry_transaction_t *opaque_tx)
+sentry__transaction_finish(sentry_transaction_t *opaque_tx, uint64_t timestamp)
 {
     if (!opaque_tx || sentry_value_is_null(opaque_tx->inner)) {
         SENTRY_DEBUG("no transaction available to finish");
@@ -919,7 +934,7 @@ sentry_transaction_finish(sentry_transaction_t *opaque_tx)
     sentry_value_set_by_key(tx, "type", sentry_value_new_string("transaction"));
     sentry_value_set_by_key(tx, "timestamp",
         sentry__value_new_string_owned(
-            sentry__usec_time_to_iso8601(sentry__usec_time())));
+            sentry__usec_time_to_iso8601(timestamp)));
     // TODO: This might not actually be necessary. Revisit after talking to
     // the relay team about this.
     sentry_value_set_by_key(tx, "level", sentry_value_new_string("info"));
@@ -959,6 +974,19 @@ sentry_transaction_finish(sentry_transaction_t *opaque_tx)
     return sentry_uuid_nil();
 }
 
+sentry_uuid_t
+sentry_transaction_finish(sentry_transaction_t *opaque_tx)
+{
+    return sentry__transaction_finish(opaque_tx, sentry__usec_time());
+}
+
+sentry_uuid_t
+sentry_transaction_finish_ts(
+    sentry_transaction_t *opaque_tx, uint64_t timestamp)
+{
+    return sentry__transaction_finish(opaque_tx, timestamp);
+}
+
 void
 sentry_set_transaction_object(sentry_transaction_t *tx)
 {
@@ -984,9 +1012,9 @@ sentry_set_span(sentry_span_t *span)
 }
 
 sentry_span_t *
-sentry_transaction_start_child_n(sentry_transaction_t *opaque_parent,
+sentry__transaction_start_child_n(sentry_transaction_t *opaque_parent,
     const char *operation, size_t operation_len, const char *description,
-    size_t description_len)
+    size_t description_len, uint64_t timestamp)
 {
     if (!opaque_parent || sentry_value_is_null(opaque_parent->inner)) {
         SENTRY_DEBUG("no transaction available to create a child under");
@@ -1003,10 +1031,19 @@ sentry_transaction_start_child_n(sentry_transaction_t *opaque_parent,
 
     sentry_value_t span = sentry__value_span_new_n(max_spans, parent,
         (sentry_slice_t) { operation, operation_len },
-        (sentry_slice_t) { description, description_len });
+        (sentry_slice_t) { description, description_len }, timestamp);
     return sentry__span_new(opaque_parent, span);
 }
 
+sentry_span_t *
+sentry_transaction_start_child_n(sentry_transaction_t *opaque_parent,
+    const char *operation, size_t operation_len, const char *description,
+    size_t description_len)
+{
+    return sentry__transaction_start_child_n(opaque_parent, operation,
+        operation_len, description, description_len, sentry__usec_time());
+}
+
 sentry_span_t *
 sentry_transaction_start_child(sentry_transaction_t *opaque_parent,
     const char *operation, const char *description)
@@ -1017,8 +1054,27 @@ sentry_transaction_start_child(sentry_transaction_t *opaque_parent,
 }
 
 sentry_span_t *
-sentry_span_start_child_n(sentry_span_t *opaque_parent, const char *operation,
-    size_t operation_len, const char *description, size_t description_len)
+sentry_transaction_start_child_ts_n(sentry_transaction_t *opaque_parent,
+    const char *operation, size_t operation_len, const char *description,
+    size_t description_len, const uint64_t timestamp)
+{
+    return sentry__transaction_start_child_n(opaque_parent, operation,
+        operation_len, description, description_len, timestamp);
+}
+
+sentry_span_t *
+sentry_transaction_start_child_ts(sentry_transaction_t *opaque_parent,
+    const char *operation, const char *description, const uint64_t timestamp)
+{
+    return sentry_transaction_start_child_ts_n(opaque_parent, operation,
+        sentry__guarded_strlen(operation), description,
+        sentry__guarded_strlen(description), timestamp);
+}
+
+sentry_span_t *
+sentry__span_start_child_n(sentry_span_t *opaque_parent, const char *operation,
+    size_t operation_len, const char *description, size_t description_len,
+    uint64_t timestamp)
 {
     if (!opaque_parent || sentry_value_is_null(opaque_parent->inner)) {
         SENTRY_DEBUG("no parent span available to create a child span under");
@@ -1039,11 +1095,19 @@ sentry_span_start_child_n(sentry_span_t *opaque_parent, const char *operation,
 
     sentry_value_t span = sentry__value_span_new_n(max_spans, parent,
         (sentry_slice_t) { operation, operation_len },
-        (sentry_slice_t) { description, description_len });
+        (sentry_slice_t) { description, description_len }, timestamp);
 
     return sentry__span_new(opaque_parent->transaction, span);
 }
 
+sentry_span_t *
+sentry_span_start_child_n(sentry_span_t *opaque_parent, const char *operation,
+    size_t operation_len, const char *description, size_t description_len)
+{
+    return sentry__span_start_child_n(opaque_parent, operation, operation_len,
+        description, description_len, sentry__usec_time());
+}
+
 sentry_span_t *
 sentry_span_start_child(sentry_span_t *opaque_parent, const char *operation,
     const char *description)
@@ -1053,8 +1117,26 @@ sentry_span_start_child(sentry_span_t *opaque_parent, const char *operation,
         sentry__guarded_strlen(description));
 }
 
+sentry_span_t *
+sentry_span_start_child_ts_n(sentry_span_t *opaque_parent,
+    const char *operation, size_t operation_len, const char *description,
+    size_t description_len, uint64_t timestamp)
+{
+    return sentry__span_start_child_n(opaque_parent, operation, operation_len,
+        description, description_len, timestamp);
+}
+
+sentry_span_t *
+sentry_span_start_child_ts(sentry_span_t *opaque_parent, const char *operation,
+    const char *description, uint64_t timestamp)
+{
+    return sentry_span_start_child_ts_n(opaque_parent, operation,
+        sentry__guarded_strlen(operation), description,
+        sentry__guarded_strlen(description), timestamp);
+}
+
 void
-sentry_span_finish(sentry_span_t *opaque_span)
+sentry__span_finish(sentry_span_t *opaque_span, uint64_t timestamp)
 {
     if (!opaque_span || sentry_value_is_null(opaque_span->inner)) {
         SENTRY_DEBUG("no span to finish");
@@ -1118,7 +1200,7 @@ sentry_span_finish(sentry_span_t *opaque_span)
 
     sentry_value_set_by_key(span, "timestamp",
         sentry__value_new_string_owned(
-            sentry__usec_time_to_iso8601(sentry__usec_time())));
+            sentry__usec_time_to_iso8601(timestamp)));
     sentry_value_remove_by_key(span, "sampled");
 
     size_t max_spans = SENTRY_SPANS_MAX;
@@ -1147,6 +1229,18 @@ sentry_span_finish(sentry_span_t *opaque_span)
     sentry__span_decref(opaque_span);
 }
 
+void
+sentry_span_finish(sentry_span_t *opaque_span)
+{
+    sentry__span_finish(opaque_span, sentry__usec_time());
+}
+
+void
+sentry_span_finish_ts(sentry_span_t *opaque_span, uint64_t timestamp)
+{
+    sentry__span_finish(opaque_span, timestamp);
+}
+
 void
 sentry_capture_user_feedback(sentry_value_t user_feedback)
 {
diff --git a/src/sentry_tracing.c b/src/sentry_tracing.c
index e42599f48..6be39f7b4 100644
--- a/src/sentry_tracing.c
+++ b/src/sentry_tracing.c
@@ -356,7 +356,7 @@ sentry__span_new(sentry_transaction_t *tx, sentry_value_t inner)
 
 sentry_value_t
 sentry__value_span_new_n(size_t max_spans, sentry_value_t parent,
-    sentry_slice_t operation, sentry_slice_t description)
+    sentry_slice_t operation, sentry_slice_t description, uint64_t timestamp)
 {
     if (!sentry_value_is_null(sentry_value_get_by_key(parent, "timestamp"))) {
         SENTRY_DEBUG("span's parent is already finished, not creating span");
@@ -378,7 +378,7 @@ sentry__value_span_new_n(size_t max_spans, sentry_value_t parent,
         sentry_value_new_string_n(description.ptr, description.len));
     sentry_value_set_by_key(child, "start_timestamp",
         sentry__value_new_string_owned(
-            sentry__usec_time_to_iso8601(sentry__usec_time())));
+            sentry__usec_time_to_iso8601(timestamp)));
 
     return child;
 fail:
@@ -387,10 +387,11 @@ sentry__value_span_new_n(size_t max_spans, sentry_value_t parent,
 
 sentry_value_t
 sentry__value_span_new(size_t max_spans, sentry_value_t parent,
-    const char *operation, const char *description)
+    const char *operation, const char *description, uint64_t timestamp)
 {
     return sentry__value_span_new_n(max_spans, parent,
-        sentry__slice_from_str(operation), sentry__slice_from_str(description));
+        sentry__slice_from_str(operation), sentry__slice_from_str(description),
+        timestamp);
 }
 
 sentry_value_t
diff --git a/src/sentry_tracing.h b/src/sentry_tracing.h
index d312b1cd4..5884e8731 100644
--- a/src/sentry_tracing.h
+++ b/src/sentry_tracing.h
@@ -37,9 +37,9 @@ void sentry__span_incref(sentry_span_t *span);
 void sentry__span_decref(sentry_span_t *span);
 
 sentry_value_t sentry__value_span_new(size_t max_spans, sentry_value_t parent,
-    const char *operation, const char *description);
+    const char *operation, const char *description, uint64_t timestamp);
 sentry_value_t sentry__value_span_new_n(size_t max_spans, sentry_value_t parent,
-    sentry_slice_t operation, sentry_slice_t description);
+    sentry_slice_t operation, sentry_slice_t description, uint64_t timestamp);
 
 sentry_span_t *sentry__span_new(
     sentry_transaction_t *parent_tx, sentry_value_t inner);
diff --git a/tests/unit/test_tracing.c b/tests/unit/test_tracing.c
index 6650410dd..04631609f 100644
--- a/tests/unit/test_tracing.c
+++ b/tests/unit/test_tracing.c
@@ -1173,7 +1173,8 @@ SENTRY_TEST(sentry__value_span_new_requires_unfinished_parent)
     // timestamps are typically iso8601 strings, but this is irrelevant to
     // `sentry__value_span_new` which just wants `timestamp` to not be null.
     sentry_value_set_by_key(parent, "timestamp", sentry_value_new_object());
-    sentry_value_t inner_span = sentry__value_span_new(0, parent, NULL, NULL);
+    sentry_value_t inner_span
+        = sentry__value_span_new(0, parent, NULL, NULL, 0);
     TEST_CHECK(sentry_value_is_null(inner_span));
 
     sentry_value_decref(parent);