CODEWITHSUNDEEP
node.jscron
Vo Thanh Thang
Vo Thanh Thang

Reputation: 370

time pattern in node-cronjob

I am using node-cron. Please help to explain to me the different between:

var pattern_1 = '58 * * * * *';
var pattern_2 = '*/58 * * * * *';

when running this function:

new CronJob(pattern, function() {
    console.log('lalalalala')
}, null, true, 'America/Los_Angeles');

Upvotes: 0

Views: 223

Answers (3)

VIKAS KOHLI
VIKAS KOHLI

Reputation: 8440

The second pattern:

var pattern_1 = '58 * * * * *';

It executes at "58th seconds of every minute".

The second pattern:

var pattern_2 = '*/58 * * * * *';

Same as pattern 1 so it also executes at "58th seconds of every minute".

Upvotes: 0

Andrea
Andrea

Reputation: 3440

As described in cron man page:

Step values can be used in conjunction with ranges. Following a range with ''/'' specifies skips of the number's value through the range.

and:

Steps are also permitted after an asterisk, so if you want to say ''every two hours'', just use ``*/2''.

So:

var pattern_1 = '58 * * * * *';

executes "at 58th seconds of every minute". The second pattern:

var pattern_2 = '*/58 * * * * *';

executes "every 58 seconds".

Upvotes: 2

PatrickD
PatrickD

Reputation: 1156

The first patterns will run your cronjob every 58th second: 00:00:58, 00:01:58, 00:02:58...and so on.

The slash character can be used to identify periodic values. For example */15 * * * * * means, that your job will run ever 15th second: 00:00:15, 00:00:30, 00:00:45 ...and so on.

In my opinion */58 doesn't look very useful. This will execute every 58th second of every minute, so just use the first one.

Upvotes: 0

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