[Tinyos-help] schedule periodic operation

[João Paulo Amaro da Costa Luz Carneiro]

Hi,
If I want to perform an operation monthly do I need to use  
startPeriodic(2629743830) with tmilli and uint32_t or is there a  
better way? How do I sync this timer for all motes in my network to  
run at the same time?
Thanks.
Best regards,

Joao