add timestap dates in human readable form in the BeamSpot DisplayParameters template class

Author: mmusich

CondCore/BeamSpotPlugins/interface/BeamSpotPayloadInspectorHelper.h

@@ -9,6 +9,7 @@
 #include "FWCore/MessageLogger/interface/MessageLogger.h"
 
 // system includes
+#include <ctime>
 #include <fmt/printf.h>
 #include <memory>
 #include <sstream>
@@ -60,6 +61,26 @@ namespace beamSpotPI {
     END_OF_TYPES = 25,
   };
 
+  /************************************************/
+  // Function to convert cond::Time_t (in microseconds) to human-readable date string
+  std::string convertTimeToDateString(cond::Time_t timeValue, bool hasMicros = false, bool toUTC = true) {
+    // Convert microseconds to seconds
+    std::time_t unixTime = static_cast<std::time_t>(hasMicros ? timeValue / 1000000 : timeValue);
+
+    // Convert std::time_t to struct tm (to UTC, or not)
+    std::tm* timeInfo = toUTC ? std::gmtime(&unixTime) : std::localtime(&unixTime);
+
+    // Convert struct tm to human-readable string format
+    char buffer[80];
+    std::strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", timeInfo);
+
+    // Append microseconds to the string
+    std::string dateString(buffer);
+    //dateString += "." + std::to_string(timeValue % 1000000);
+
+    return dateString;
+  }
+
   /************************************************/
   inline std::string getStringFromParamEnum(const parameters& parameter,
                                             const bool addUnits = false /*not used by default*/) {
@@ -432,6 +453,29 @@ namespace beamSpotPI {
             (tagname + " IOV: #color[4]{" + std::to_string(runLS.first) + "," + std::to_string(runLS.second) + "}")
                 .c_str());
 
+        if constexpr (std::is_same_v<PayloadType, BeamSpotOnlineObjects>) {
+          canvas.cd(2);
+          ltx.SetTextSize(0.025);
+          ltx.DrawLatexNDC(
+              gPad->GetLeftMargin() + 0.01,
+              gPad->GetBottomMargin() + 0.15,
+              ("#color[2]{(" + beamSpotPI::convertTimeToDateString(m_payload->creationTime(), /*has us*/ true) + ")}")
+                  .c_str());
+
+          ltx.DrawLatexNDC(
+              gPad->GetLeftMargin() + 0.01,
+              gPad->GetBottomMargin() + 0.085,
+              ("#color[2]{(" + beamSpotPI::convertTimeToDateString(m_payload->startTimeStamp()) + ")}").c_str());
+
+          ltx.DrawLatexNDC(
+              gPad->GetLeftMargin() + 0.01,
+              gPad->GetBottomMargin() + 0.025,
+              ("#color[2]{(" + beamSpotPI::convertTimeToDateString(m_payload->endTimeStamp()) + ")}").c_str());
+
+          ltx.DrawLatexNDC(
+              gPad->GetLeftMargin(), gPad->GetBottomMargin() - 0.05, "#color[4]{N.B.} TimeStamps are in UTC");
+        }
+
         std::string fileName(this->m_imageFileName);
         canvas.SaveAs(fileName.c_str());