Bulk action / mass update desk ticket time entries

Bulk action / mass update desk ticket time entries

Hello,

we need to update a high number (~ 2000) of time entries on a specific date (on the first day of every month). To be more presice: Time entries contain a custom field (bool) and all time entries which have the value "true" need to be changed. How we can do this?!

Best regards,
Sven