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extensibility beyond standard cron libraries like [robfig/cron](https://github.com/robfig/cron), cronfab exposes a configurable field system: define custom calendar fields (e.g. week-of-month, moon phase) with named ranges and arbitrary units — no forking required.\n\nAll the standard crontab features are supported:\n- units may be specified by number or name (with prefix matching — `jan`, `mon`, etc.)\n- lists and ranges are supported\n- step values are supported\n- aliases: `@yearly`, `@annually`, `@monthly`, `@weekly`, `@daily`, `@midnight`, `@hourly`\n\nCronfab does not support shell command execution.\n\nBuilt-in Configs\n----------------\n\n- **`DefaultCrontabConfig`** — classic 5-field: minute, hour, day-of-month, month, day-of-week\n- **`SecondCrontabConfig`** — 7-field: second, minute, hour, day-of-month, week-of-month, month, day-of-week\n\nBoth configs include aliases (`@daily`, `@hourly`, etc.) that expand to their corresponding expressions.\n\nExample\n-------\n\n```go\nmarkers, err := cronfab.DefaultCrontabConfig.ParseCronTab(\"*/5 * * * *\")\nif err != nil {\n\tlog.Fatal(err)\n}\n\nnext, err := cronfab.DefaultCrontabConfig.Next(markers, time.Now())\nif err != nil {\n\tlog.Fatal(err)\n}\nfmt.Println(next)\n```\n\nAliases work the same way:\n\n```go\nmarkers, err := cronfab.DefaultCrontabConfig.ParseCronTab(\"@daily\")\n```\n\nCustom Calendars\n----------------\n\n`FieldConfig` fields are exported, so any package can construct its own calendar by implementing the `Unit` interface and calling `NewCrontabConfig`:\n\n```go\nconfig, err := cronfab.NewCrontabConfig([]cronfab.FieldConfig{\n\t{\n\t\tUnit:     cronfab.HourUnit{},\n\t\tName:     \"hour\",\n\t\tMin:      0,\n\t\tMax:      23,\n\t\tGetIndex: func(t time.Time) int { return t.Hour() },\n\t},\n\t{\n\t\tUnit:       MoonPhaseUnit{},\n\t\tName:       \"moon phase\",\n\t\tRangeNames: []string{\"new\", \"waxingcrescent\", \"firstquarter\", \"waxinggibbous\", \"full\", \"waninggibbous\", \"thirdquarter\", \"waningcrescent\"},\n\t\tMin:        0,\n\t\tMax:        7,\n\t\tGetIndex:   moonPhaseIndex,\n\t},\n})\n```\n\nCustom configs can also define their own aliases by setting the `Aliases` map on the returned `*CrontabConfig`.\n\nA full working example is in [examples/lunar](examples/lunar).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Faalpar%2Fcronfab","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Faalpar%2Fcronfab","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Faalpar%2Fcronfab/lists"}