diff --git a/bmc_state_manager.cpp b/bmc_state_manager.cpp
index 9f67a31..efaa0a2 100644
--- a/bmc_state_manager.cpp
+++ b/bmc_state_manager.cpp
@@ -242,6 +242,20 @@
     return server::BMC::lastRebootCause(value);
 }
 
+void BMC::updateLastRebootTime()
+{
+    using namespace std::chrono;
+    struct sysinfo info;
+
+    auto rc = sysinfo(&info);
+    assert(rc == 0);
+    // Since uptime is in seconds, also get the current time in seconds.
+    auto now = time_point_cast<seconds>(system_clock::now());
+    auto rebootTimeTs = now - seconds(info.uptime);
+    rebootTime =
+        duration_cast<milliseconds>(rebootTimeTs.time_since_epoch()).count();
+}
+
 uint64_t BMC::lastRebootTime() const
 {
     return rebootTime;