Following my question about cron job and timezone
I would like to know what would be the best way to schedule things at different time zones:
I have multiple cron jobs like those that i need to run and my code from previous post doesn't seem to cut it.
I don't know what is the best way to proceed as it should be independent of the server time, so working with UTC time doesn't really cut it.
package main
import (
"fmt"
"github.com/robfig/cron"
"os"
"os/signal"
"time"
)
func helloWorld() {
fmt.Println("hello world")
}
func main() {
s, err1 := cron.Parse("30 10 * * *")
fmt.Println(err1)
l, err := time.LoadLocation("Asia/Tokyo")
fmt.Println(err)
c := cron.NewWithLocation(l)
c.Schedule(s, cron.FuncJob(helloWorld))
c.Start()
sig := make(chan os.Signal)
signal.Notify(sig, os.Interrupt, os.Kill)
<-sig
}
After my previous post i've found that you could check the scheduler this way :
test := c.Entries()
log.Println(test[0].Schedule)
log.Println(test[0].Next)
log.Println(test[0].Prev)
and got as result (the first 2 nils being the err "handling"):
<nil>
<nil>
2019/05/30 00:59:21 &{1073741824 1024 9223372036871553023 9223372041149743102 9223372036854783998 9223372036854775935}
2019/05/30 00:59:21 2019-05-30 01:10:30 +0900 JST
2019/05/30 00:59:21 0001-01-01 00:00:00 +0000 UTC
You can see that it's scheduled to run at 01:10:30 Japan time ( JST ) instead of 10:30 AM JST that i expected.
Anybody know what's happening. I'm gonna need to do this for upward of 70 timezones..
As stated in the docs s, err1 := cron.Parse("30 10 * * *") creates a new cron job executed hourly at exactly 10mins and 30sec.
Because your time was 2019/05/30 00:59:21 the next avaiable slot would be exactly like stated 01:10:30 +0900 JST.
To create a new job executed daily at 10:30 local time use s, err1 := cron.Parse("0 30 10 * *") instead. For a quick overview use Predefined schedules in the docs, it displays it in a nice table.