Do you mean can you record timestamps as data in emoncms feeds? If so, no not really.

The phptimeseries and phpfina feed engines store data as a 32bit double so there are 7 digits of precision so (for example) 1569674191 would be stored as 1569674000, the net result is that all timestamp values will be rounded to the nearest 16.66 mins IIRC. eg if you were using a phptimeseries feed and at 1569674191 you attempted to store a value of 1569674191, the result would be the 1569674191 datapoint would contain a value of 1569674000, as would the 1569674201 datapoint and so on until the *value* can round up to 1569675000.