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The cron command-line utility is a job scheduler on Unix-like operating systems.Users who set up and maintain software environments use cron to schedule jobs [1] (commands or shell scripts), also known as cron jobs, [2] [3] to run periodically at fixed times, dates, or intervals. [4]
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
webcron is the term for a time-based job scheduler hosted on a web server.The name derives its roots from the phrase web server and the Unix daemon cron.A webcron solution [buzzword] enables users to schedule jobs to run within the web server environment on a web host that does not offer a shell account or other means of scheduling jobs.
To determine "longitude by chronometer," a navigator requires a chronometer set to the local time at the Prime Meridian. Local time at the Prime Meridian has historically been called Greenwich Mean Time (GMT), but now, due to international sensitivities, has been renamed as Coordinated Universal Time (UTC), and is known colloquially as "zulu time".
As with Anacron, it does not assume that the system is running continuously, and can run in systems that do not run all the time or regularly. It aims to replace Vixie-cron and Anacron with a single integrated program, providing many features missing from the original Cron daemon. [3] Some of the supported options permit: [3] run jobs one by one
anacron is a computer program that performs periodic command scheduling, which is traditionally done by cron, but without assuming that the system is running continuously.. Thus, it can be used to control the execution of daily, weekly, and monthly jobs (or anything with a period of n days) on systems that don't run 24 hours a
UTC does not change with a change of seasons, but local time or civil time may change if a time zone jurisdiction observes daylight saving time (summer time). For example, local time on the east coast of the United States is five hours behind UTC during winter, [23] but four hours behind while daylight saving is observed there. [24]
Android uses Unix time alongside a timezone for its system time API. [20] Windows does not use Unix time for storing time internally but does use it in system APIs, which are provided in C++ and implement the C standard library specification. [16] Unix time is used in the PE format for Windows executables. [21]