On a calendar. What is the correct way to make the start time and end time range all day for all users?

I work on a project where the client uses the calendar to manage appointments. Appointments can be attended all day. The client wants the calendar to have a default starting time of 1:00 am until 12:45 pm. It is desired to prevent the user from having to make this change in the configuration. What is the correct way to make the default start and end time values 1:00 am and 12:45 pm respectively?

Right now, the default values are 8:00 am to 6:00 pm

These are saved in User Profile settings which are encoded.
If you can push these on each user Create, then it will show the Calendar ranges that you want to set.

Thanks for answering. I manage to solve as follows.

I Modified lines 217 and 221 of the file app/suitecrm/modules/Calendar/Calendar.php

Line 217

- $this->day_start_time = SugarConfig::getInstance()->get('calendar.default_day_start', "08:00");
+ $this->day_start_time = SugarConfig::getInstance()->get('calendar.default_day_start', "01:00");

Line 221

- $this->day_end_time = SugarConfig::getInstance()->get('calendar.default_day_end', "19:00");
- $this->day_end_time = SugarConfig::getInstance()->get('calendar.default_day_end', "24:45");