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You probably want to use the ros::Time::now().toSec()
result, which is a double.
http://docs.ros.org/latest/api/rostime/html/classros_1_1TimeBase.html#ab63e3c9f57032143d4eeac4a7ac272a5
Then you can convert that double to a string with std::string to_string
.
You could use strftime
to convert the double to many different string formats as well.
http://www.cplusplus.com/reference/ctime/strftime/