Date calculators · Home & hobbies
Home Maintenance Calendar
Plan maintenance for multiple tasks using calendar intervals, meter readings or both. See what is due first and estimate usage-trigger dates from your daily rate.
Your calculation
Ready when you are
Choose your dates.
Select your counting rules and calculate.
Calculation details
| Step | Value |
|---|
How to use this calculator
Choose a check date. For each task enter last completion, a calendar interval, or meter readings and a usage interval. Set zero to disable a trigger. A zero daily rate leaves the usage forecast unknown.
A task is due when either time or usage reaches its threshold. The queue is sorted by the earliest known date, with overdue work still visible. Following calendar dates can use an assumed completion on the check date or retain the original cadence. This planner does not save service history.
A worked example
A three-month filter task last completed August 2 is due November 2. Equipment serviced at meter 100 and now at 180, with a 100-unit interval and five units per day, reaches its usage threshold four days after the check date.
Are maintenance intervals provided for my equipment?
No. Enter the manufacturer's or your own confirmed intervals. Usage dates assume a constant rate. The following-date preview assumes completion now and does not mark a task completed or change its current due status.
Further reading: Source workflow and conventions. Your entered rules determine this result.
Which calendar and years are supported?
Use Gregorian dates from 1900 through 2100, with results inside that range. Most daily plans are limited to 366 dates; academic terms and sprint plans allow up to 731. Forms limit the number of entries to keep calculations responsive. Holidays and policy rules come from your inputs. Date-only plans ignore DST; tools with time-zone inputs use the browser's time-zone data and explicitly resolve repeated times. Calendar exports preserve date-only markers or exact timed events as appropriate. Calculations run only when requested, without background polling.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.