Cron x/y pattern not working as espected

Hi,

I noticed that pattern x/y, as every y starting from x is not wotking

According to crontab.guru this pattern should produce:

“At every 2nd minute from 0 through 59.”

But in the attached code i’ve noticed a different behavior (applied to seconds for brevity). It triggers just at the very start of every minute insted of every 2 seconds starting from second 0

var event = schedule.scheduleJob("0/2 * * * * *", function() { var dt = dateTime.create(); console.log("Inserting new data: " + dt.format('Y-m-d H:M:S')); });

Output:

Inserting new data: 2017-09-13 16:35:00 Inserting new data: 2017-09-13 16:36:00 Inserting new data: 2017-09-13 16:37:00 Inserting new data: 2017-09-13 16:38:00

[santigimeno]

@fabiomor I’ve been looking into this and TBH after reading the crontab manual I’m not sure that format is correct:

Step values can be used in conjunction with ranges. Following a range with “/<number>” specifies skips of the number’s value through the range. For example, “0-23/2” can be used in the ‘hours’ field to specify command execution for every other hour (the alternative in the V7 standard is “0,:2,:4,:6,:8,:10,:12,:14,:16,:18,:20,:22”). Step values are also permitted after an asterisk, so if specifying a job to be run every two hours, you can use “*/2”.

I’m not completely sure that using a value with step values is a valid crontab expression. It seems that only ranges and * are valid. /cc @harrisiirak what do you think?

Anyway, for your use case you could always use 0-59/2 * * * * * and it should work.

[santigimeno]

Closing then. Thanks!