Hello, i am trying to do a backup with doveadm backup command. I need to set date filter with argument [-e end date]. Doing so with -e 2020-01-01 or -e 1577829600 shows error:

dovecot: doveadm: Error: dsync(mail-archive.domain.com): handshake: Invalid sync_until_timestamp: 0

What is the correct way of time filter?