Quartz.net

https://www.quartz-scheduler.net/

https://coderoad.ru/21633029/%D0%9C%D0%BE%D0%B6%D0%BD%D0%BE-%D0%BB%D0%B8-%D0%B2%D1%8B%D1%80%D0%B0%D0%B7%D0%B8%D1%82%D1%8C-2-%D0%BD%D0%B5%D0%B4%D0%B5%D0%BB%D1%8C%D0%BD%D1%8B%D0%B5-%D0%BF%D0%B5%D1%80%D0%B8%D0%BE%D0%B4%D1%8B-%D0%BA%D0%B0%D0%BA-%D0%B2%D1%8B%D1%80%D0%B0%D0%B6%D0%B5%D0%BD%D0%B8%D0%B5-CRON-%D1%80%D0%B5%D0%B0%D0%BB%D0%B8%D0%B7%D0%BE%D0%B2%D0%B0%D0%BD%D0%BD%D0%BE%D0%B5-Quartz

https://customerfx.com/article/creating-specific-process-start-times-using-timers-and-cron-expressions-in-creatio-processes/

flux

https://flux.ly/time-expressions