The event recored time

3b40e00dd24c6803d90e · 1 October 2022 00:45

Hi,

I am using CMSSW_5_3_32 to analyze the “/DoubleMu/Run2011A-12Oct2013-v1/AOD” dataset (DoubleMu primary dataset in AOD format from RunA of 2011). I would like to extract the event recored time of each event, just like displayed in CERN Open Data Portal, e.g. “data recorded: 2011-Jun-25 00:14:59.597978 GMT”. Could you tell me how to do that? Thank you so much!

Best,
Ke-Pan

mccauley · 4 October 2022 14:46

In this instance the event time information was extracted from the event using this code (which is part of a package that makes the event display format):

github.com

cms-outreach/ispy-analyzers/blob/Run2011A/src/ISpyEvent.cc

#include "ISpy/Analyzers/interface/ISpyEvent.h"
#include "ISpy/Analyzers/interface/ISpyService.h"
#include "ISpy/Services/interface/IgCollection.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ServiceRegistry/interface/Service.h"

#include "boost/date_time/posix_time/posix_time.hpp"
#include <sys/time.h> 

using namespace edm::service;

namespace {
  std::string
    getLocalTime(const edm::Event& event)
  {
    time_t t(event.time().value() >> 32);
    std::string text(asctime(localtime(&t)));
    size_t pos = text.find('\n');

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You can adapt this for your own purposes. Hope this helps.
Tom