If you like to have the Unix epoch in your prompt, you can do something like this: function prompt_epoch() { printf -v COMMA_EPOCH "%'d" ${EPOCHSEC

If you like to have the Unix epoch in your prompt, you can do something like this: function prompt_epoch() { printf -v COMMA_EPOCH "%'d" ${EPOCHSECONDS} p10k segment -f 66 -t ${COMMA_EPOCH} } EPOCHSECONDS relies on `zmodload zsh/datetime`. printf -v creates a variable rather than output text. p10k segment is just a function that powerlevel10k uses, you don't have to use it. COMMA_EPOCH is just the current Unix time separated by commas every 3 digits. If you wanted your own countdown, you could easily do `2147483647 - EPOCHSECONDS` and display that time instead. EDIT: and if you want to mimic that oh-so-cool clock, you could do: printf '%x\n' $EPOCHSECONDS or assign that to a variable with printf -v, then split the string into pairs. Mimicking the colours of the clock would be fairly trivial too.