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Life & fun · October 23, 2020

GA

Greg – a simple “cal” clone written in C

Greg – a simple “cal” clone written in C launched on October 23, 2020 with 60 votes, #859 of 4,018 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 5 years on.

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In plain words

Greg is a calendar application written in C that replicates the functionality of the Unix "cal" command. Launched in 2020, it provides a simple way to view calendar information. The tool is designed for users who prefer a lightweight command-line calendar utility, particularly those familiar with traditional Unix tools. Greg appeals to developers and command-line users seeking a straightforward calendar display without unnecessary complexity.

written from the facts on this page · September 2026

From the sources

You can customize the first day of the adoption of the Gregorian calendar by defining the macro greg_cutover , e.g. -Dgreg_cutover=2020,10,15 (format: YYYY,MM,DD ). The default is the fourteenth of September of 1752. The default first day of the week can also be configured at compile time with the macro greg_first_weekday , where 0 is Sunday and 6 is Saturday. E.g. -Dgreg_first_weekday=1 for Monday. Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted. THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO…from greg-calendar.vercel.app

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