The reference documentation is found at https://en.wikipedia.org/wiki/Cron#CRON_expression
Field name Mandatory Allowed values Allowed special characters
---------- ---------- -------------- --------------------------
Seconds No 0-59 * / , -
Minutes Yes 0-59 * / , -
Hours Yes 0-23 * / , -
Day of month Yes 1-31 * / , - L W
Month Yes 1-12 or JAN-DEC * / , -
Day of week Yes 0-6 or SUN-SAT * / , - L #
Year No 1970–2099 * / , -
go get -u github.com/flyaways/cronpackage main
import (
"fmt"
"time"
"github.com/flyaways/cron"
)
type task struct {
cron.Job
id string
expr string
}
func (t *task) Run() {
fmt.Println(time.Now().Format(time.RFC3339Nano))
}
func (t *task) ID() string {
return t.id
}
func (t *task) Cronexpr() string {
return t.expr
}
func main() {
c := cron.New()
c.Start()
c.Add(&task{
id: "AF0783D4-D16A-4CAE-8866-4E0648AE3651",
expr: "0/2 * * * * ?",
})
time.Sleep(time.Second * 10)
c.Update(&task{
id: "AF0783D4-D16A-4CAE-8866-4E0648AE3651",
expr: "0/5 * * * * ?",
})
time.Sleep(time.Second * 10)
c.Del(&task{
id: "AF0783D4-D16A-4CAE-8866-4E0648AE3651",
})
time.Sleep(time.Second * 10)
c.Stop()
}