: A highly-rated visual tracker for both countdowns and "count-up" timers (days since).

are you looking to track so I can recommend the best tool?

: For professional tracking, tools like Productivity Planners or Production Calendars help count working days in a month.

Как узнать количество рабочих дней в месяце - Моё дело

: Available on the Google Play Store and Apple App Store, these apps allow you to set reminders for birthdays, holidays, or milestones.

: Often used as a simple way to manually track dates on the desktop.

: Apps like Quit Tracker or general habit trackers act as day counters to help you see progress after quitting smoking or starting a new routine.