Thanks for mentioning that. It looks like there is support in HLedger for per-posting / per-account dates via `date:` tags[0]; I'm not sure how I missed that before. For the auxiliary dates, I suppose one could just ignore balance assertions when using the `--date2` option, but IMHO it would be better to set a posting date for the bank account for when the transfer cleared rather than an auxiliary date on the transaction as a whole. The expense account would then show when the expense was incurred, and the bank account would show when it cleared. Usually only the latter would have a balance assertion.

[0] https://hledger.org/1.25/hledger.html#posting-dates