System.schedule in Apex scheduler in Salsforce

System.schedule in Apex scheduler in Salsforce

Sample code:

SampleSchedulableClass obj = new SampleSchedulableClass();

String cron = ‘0 59 * * * *’
System.schedule(‘Testing’, cron, obj);


The above code executes SampleSchedulableClass for every one hour.

Syntax for Cron:


Seconds Minutes Hours Day Month Week Year


Seconds : 0 – 59
Minutes  : 0 – 59
Hours     : 0 – 23
Day        : 1 – 31
Month    : 1 – 12
Week     : 1 – 7(Sunday is first and Saturday is last)
Year       : upto 2099


Year is optional.

Expression
Description
0 0 13 * * ?
Class runs every day at 1 PM.
0 0 22 ? * 6L
Class runs the last Friday of every month at 10 PM.
0 0 10 ? * MON-FRI
Class runs Monday through Friday at 10 AM.
0 0 20 * * ? 2010
Class runs every day at 8 PM during the year 2010.



? – No value
* – All values
L – Last
W – Nearest weekday

Cheers!!!

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