#[3] did not have this problem with LND and Zeus
I decoded the invoice both with lightning-cli and bolt-11 and they both output the unix timestamp.
My understanding, based on https://github.com/lightning/bolts/blob/master/11-payment-encoding.md#tagged-fields, is that the x field is supposed to be set to the time in seconds. Or am I misunderstanding this?
Discussion
Nope, it works as expected with Zeus backed by LND.