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This is, for me, unverifiable information; hence this question.
Someone with a deeper knowledge of German than mine has recently told me that auf can also mean during, just like bei.
For instance, this person has told me that bei Tage(e) or bei Nacht can equally be rephrased as auf Tag(e) and auf Nacht, without losing its meaning.
However, my own research has turned no proof that this might be true.
Is it true?
One thing I can imagine is that you mean something like:
in der Nacht von Montag auf Dienstag / in der Nacht auf Dienstag
This indeed means »during the night from monday to tuesday«.
»Auf Tag/Nacht« cannot mean »bei Tag/Nacht«, but can at least be used to describe a day/night partly:
Die Übergangsphase von Nacht auf Tag heißt Morgendämmerung.
(The transitional phase from night to day is called dawn.)Die Übergangsphase von Tag auf Nacht heißt Abenddämmerung.
(The transitional phase from night to day is called dusk.)
However, »auf« can mean »during«.
Auf der Reise gab es viel zu sehen.
(There was a lot to see during the journey.)
Again, upon further study, I have discovered that auf and bei can both mean during (während), according to a most authoritative source.
Also, by all accounts, they do seem to be interchangeable when meaning during (während), at least according to this source, of which reputability I have for the time being absolutely no clue at all (except, perhaps, its being a German language learning site).
In conclusion, then, as far as these credible sources are concerned, and very much at variance with what Pollitzer told me earlier in the day, the generic »Während der Reise...« does seem in sooth to be fairly interchangeable with both »Bei der Reise...« and »Auf der Reise...«.
