I glimpsed over your first topic from 2023. Were the details you posted from some notes from your father?
Have you tried some rather obvious choices for "THE DATE" like date of Bitcoin Whitepaper, date of Bitcoin Genesis block, date of your father's registration on bitcointalk, his birthdate, his wedding date, your birthdate? You may need to try various typing styles or what's just common for your father. Have you tried THE DATE literally, as written here in italics?
To systematically check every possible way and not missing something AND if you're that paranoid to avoid using tools for this, you need to be very good at not making errors and document every trial carefully. Reliable and reputable tools exist and are better for this, but you need to learn to use them properly when you want to refuse "easy guides". Many guides by good and reputable members are already in this forum.
Have you tried some rather obvious choices for "THE DATE" like date of Bitcoin Whitepaper, date of Bitcoin Genesis block, date of your father's registration on bitcointalk, his birthdate, his wedding date, your birthdate? You may need to try various typing styles or what's just common for your father. Have you tried THE DATE literally, as written here in italics?
To systematically check every possible way and not missing something AND if you're that paranoid to avoid using tools for this, you need to be very good at not making errors and document every trial carefully. Reliable and reputable tools exist and are better for this, but you need to learn to use them properly when you want to refuse "easy guides". Many guides by good and reputable members are already in this forum.
If the date really is the password to the wallet.dat then you just need Hashcat. Maybe you don't even need hashcat because the amount of valid combinations for the date are extremely small compared to say searching all 16-character passwords. Just get a GPU farm, make a script that will write all the dates between say 2010 and 2018 or something, varying by the second, and let it run for a few hours.