It is common that when developing projects you do not need to have your dev environments active on off-working hours (e.g. during night). Although dev environments usually do not use lots of resources, it is an extra benefit to have those environments stoping and starting automatically at your preferred hours, so you do not have to do it manually.
There is a new Add-on solution on Jelastic marketplace called "Env Start/Stop Scheduler". Just click on the installation icon and set your preferred times in a similar way you set up a cron job.
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A detailed step-by-step article can be found here:
Scheduler for Automatic Start and Stop of Development Environments to Save Cloud Costs