Calendar - free
Give any event a project - Site A, a client, a tender - and filter the whole calendar to that one project. Log the hours you actually spent against what you planned, tick events off as complete, and see the week's totals day by day. Free.

Type a project name in the event form. The project shows in the event's details, in site diary exports and in Project Report.
Pick a project in the All projects filter at the top of Calendars to see only its events in every view; choose All projects to clear it.
Edit an event and fill in Actual duration (hrs) - 1.5 for 90 minutes - and tick Completed.
Choose Tracking & at a glance in the ··· menu for the week's planned hours, logged hours, completed events and a day-by-day breakdown.
Projects and time tracking help has every option in detail.
Free in Calendar. No time limit, no account and no ads - in the Windows app and in your browser, and your diary never leaves your PC. Calendar Pro is there when you want reminders, printable planners, Project Report, the AI assistant or more themes.
Project Report in Calendar Pro exports a project's events and hours as CSV, for a timesheet or invoice backup. The weekly totals in Time Tracking are free.
Each occurrence you log hours on counts in that week's totals. Project Report lists the series once, marked as repeating.
No. Projects and hours are kept on your PC with the rest of your calendar.

Day, Week, Timeline, Month and Agenda - drag to reschedule, week numbers and UK bank holidays.

Notes for every day, exported as a formatted site diary for any date range.

Windows notifications before your events, even when Calendar is closed.

Day, week, month and year wall planners in three styles - print or PDF.

Every event for a project, planned against logged hours, with CSV export.

Diary entries, weekly update emails and project summaries - private, on your PC.

Midnight, Graphite, Forest, Plum, Paper and Ocean.

All twelve months at once, with event dots - click a day to open it.

Bank holidays for Scotland, Northern Ireland and Ireland, and the clock changes.

Weekly and monthly timesheets from your hours, and an invoice from them.

Everything in one file - restore with a preview, merge or replace, and undo.
Calendar is free, in your browser and on Windows. Calendar Pro is a one-off £5.99 in the Windows app, with a free 7-day trial.