🗓️ Class Schedule Builder

Add your classes with day and time to build a weekly timetable. Overlapping classes on the same day are automatically flagged.

How a clash is detected

Classes are grouped by day, sorted by start time, then each one is compared with the class immediately before it on that day:

conflict when  start(next) < end(previous)

Mon  Calculus 101   09:00 - 10:15
     Chemistry Lab  10:00 - 12:00    10:00 < 10:15  ->  15 minute clash

The comparison is strict, so a class ending at 10:15 and the next starting at 10:15 is not flagged - back-to-back lectures are treated as fine even when the rooms are ten minutes apart. Rows with a blank start or end time are ignored entirely, and a row with no name is listed as "Untitled Class".

Reading the weekly list

Only days that actually contain a class are printed, so a Tuesday-free timetable shows no Tuesday heading.
The badge counts every row with valid times and turns red the moment one overlap exists.
Saturday and Sunday are available in the day list for weekend labs and revision sessions.

Only neighbouring pairs are checked. One long block that swallows two shorter classes - a 09:00 to 12:00 lab with classes at 10:00 and 11:00 - reports the first overlap but not the second, because after sorting, the 11:00 class is compared against the 10:00 one. Fix the clash you are shown, then look again.

Frequently asked questions

Does the schedule save when I close the tab?

No. Everything lives in the page while it is open, so a refresh returns you to the three sample classes. Copy the finished timetable into a document or calendar before you leave.

How do I add a class that meets on several days?

Add one row per day. A Monday, Wednesday and Friday lecture needs three rows with the same name and times, which is also what lets each day be checked for clashes on its own.

Can I put in a class that runs past midnight?

Not as a single row. Times are compared as minutes within one day, so an end time earlier than the start time produces a negative span and silently breaks the overlap check. Split it into two rows on consecutive days.