Install cl-local-time by entering the following commands in the terminal:
sudo apt update sudo apt install cl-local-time
Common Lisp library for date and time manipulations
local-time is a development library for manipulating date and time information in a semi-standard manner. It is based almost entirely off of Erik Naggum's paper, The Long, Painful History of Time. . It includes such features as: Time and date arithmetic, ISO 8601 timestring formatted output and parsing, Reader macros to embed timestrings directly in code, Timezone handling (will read unix tzfile format), Conversion between universal and unix time epochs, Julian date calculation.