public Builder clearRdbSnapshotStartTime() {
        bitField0_ = (bitField0_ & ~0x00000002);
        rdbSnapshotStartTime_ = null;
        if (rdbSnapshotStartTimeBuilder_ != null) {
          rdbSnapshotStartTimeBuilder_.dispose();
          rdbSnapshotStartTimeBuilder_ = null;
        }
        onChanged();
        return this;
      }
<pre>
Optional. Time that the first snapshot was/will be attempted, and to
which future snapshots will be aligned. If not provided, the current time
will be used.
</pre>

<code>
.google.protobuf.Timestamp rdb_snapshot_start_time = 2 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-valkey/proto-google-cloud-valkey-v1beta/src/main/java/com/google/cloud/memorystore/v1beta/PersistenceConfig.java