Online Booking Calendar with Smart Slot Calculation
AsentTime's booking engine does not read availability from a fixed list — it recalculates on every request. Service duration, buffer time before and after, staff working hours, time-off records and that person's existing bookings all feed the calculation. The result: customers only ever see genuinely open times, and a clashing booking cannot be created.
What problem does it solve?
When appointments are placed by hand, double bookings, appointments on a staff member's day off and long services squeezed into gaps too small for them are inevitable.
What you can do
Slots generated from service duration
Every service has its own length. The system looks for an uninterrupted gap large enough for the selected service, so the times shown for a fifteen-minute service differ from a two-hour one.
Per-staff hours and time off
Each team member has their own weekly working days, time ranges, breaks and time-off records. A calendar closes automatically while someone is away.
Preparation and clean-up buffers
Buffer time before or after a service is held on the calendar but is not shown to the customer as part of the appointment length.
Multi-location calendars
Each branch has its own staff, hours and service list. Customers pick a branch and see that branch's availability.
Instant notifications
New bookings, cancellations and changes appear in your panel and mobile app immediately. There is nothing to refresh.
Optional approval step
Choose whether bookings confirm automatically or wait for your approval. Pending bookings are collected in their own list.
How is availability calculated?
The most critical part of any booking system is the answer to "which times are free?". If that answer is read from a static list, it loses touch with reality quickly; it has to be recalculated on every request.
AsentTime uses five inputs: the selected service's duration, its preparation and clean-up buffers, the staff member's working ranges that day, their time-off and break records, and their existing bookings. Combining these produces the uninterrupted open ranges, and only those long enough for the service are shown.
The consequence is that clashes are prevented by the structure rather than by a validation step. The system never shows a conflicting time, so a customer cannot select one.
Calendar views and daily use
The calendar can be viewed by day, week or month. The daily view puts staff in side-by-side columns so you can see at a glance who is free when.
Bookings can be rearranged on the calendar. When a time is changed, the system checks whether the new slot is genuinely available and refuses the move if it is not.
Each booking is coloured by status: pending, confirmed, completed, cancelled, no-show. At the end of the day you can read the picture without opening a list.
Daily, weekly and monthly views
Day plan with staff columns
Drag to reschedule
Colour coding by status
Quick booking creation
Search and filter past appointments
Time zones and date consistency
The most insidious class of bug in booking systems comes from time zones: when the server assumes one zone and the browser another, appointments shift by an hour — usually noticed only at a daylight saving transition.
AsentTime performs all date calculations against a single time zone, producing the same result regardless of where the calculation runs. This comes from how the system was designed from the start rather than from patches applied later.
How to get started
Define services with their durations
Enter each service's length, price and any buffer time required.
Enter your working hours
Set business hours and each staff member's own calendar, including breaks and days off.
Share your booking page
Add your personal link to your social profiles and Google Business listing.
Work from the calendar
Follow bookings in daily, weekly and monthly views, and rearrange them by dragging.
Frequently Asked Questions
Can two bookings be made for the same slot?
No. Availability is recalculated on every request and a taken slot is never shown. Availability is verified again as the booking is created.
Can I manage services of different lengths on one calendar?
Yes. Each service has its own duration and buffer time, and availability is calculated from the service the customer selects.
How do I block out a staff member's days off?
Enter a time-off record and their calendar closes automatically for those dates, so the slots never appear as available.
Can I require bookings to be approved?
Yes. You choose whether bookings confirm automatically or wait for your approval.
Can customers book outside office hours?
Your booking page never closes. Customers can book at night and will only see slots inside the working hours you defined.
Key features for this industry
Related industries
Get started for your business today
Setup takes minutes and no card is required. You can use every feature free of charge during the trial period.
