How parenting time is usually counted — and why your total looks “one short”

The most common shock in a custody log is this: you had the children from Friday afternoon to Sunday evening, and the software says 2 nights, not 3 days. Or you entered January 1–11 and the total is 10.

That is not a rounding bug. It is the usual rule: count the nights the child slept at your home, not the number of calendar dates that were “involved.”

This page explains that math in plain language. It is how Custody Proof counts, and it matches the convention many family courts use when they talk about parenting time. It is not a statement of the law in your county. How your order, your child-support worksheet, or your judge counts time is a question for your attorney.

The shorter, in-app version of these rules is How custody time is counted.

Overnights, not days

When a stay has a start date and an end date, the end date is the morning the stay ends — the return or exchange day. That morning is not a night at your home, so it is not an overnight.

Example A. The children are with you from January 1 to January 11.

• They sleep at your home the nights of Jan 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10.
• On Jan 11 they go back. No night on the 11th.
• 10 nights, even though 11 calendar dates were touched.

Example B. Friday after school to Sunday evening.

• Friday night: yes.
• Saturday night: yes.
• Sunday night: no — they are not sleeping at your home.
• 2 nights, not a “3-day weekend.”

If you count “days” you will always come out one higher than a night count on a stay that ends on the return morning. People then think the log is “one short.” It is using a different unit.

Timed visits are a separate column

A Wednesday 3:30–7:30 p.m. dinner is parenting time. It is not an overnight. If you fold those hours into an overnight percentage, the percentage stops meaning “nights slept” and starts meaning “a mix of two units.” That mix is hard to defend and easy to argue about.

Keep two ledgers:

• Overnights → unique nights → the percentage.
• Timed visits → a count of visits and a total of hours.

In Custody Proof, timed visits never enter the overnight percentage. They show up as visit counts and hours on the dashboard and in statistics. That is intentional.

A single-day entry with no times is treated as 1 day. If the time had hours, log it as a timed visit so the hours exist.

One night is one night, even with more than one child

If both children slept at your home on Tuesday, that is one Tuesday. Custody percentage is a measure of your time, not a per-child multiplier.

Per-child detail still matters. It belongs in a by-child view, and on reports as a clearly labeled child-night total (2 children × 1 night = 2 child-nights, and still 1 night). If those two numbers are unlabeled, someone will think you inflated the count. Label them.

How a percentage is built

Custody Proof’s overnight percentage for a period is:

unique custody nights you logged in the period ÷ number of days in the period

• The period is the one you selected (year to date, a month, a custom range).
• The percentage is capped at 100%.
• Timed visits are not in this number.

Why your percentage and “theirs” do not add to 100%. A one-parent log only knows what you entered. Days with nothing logged are not automatically the other parent’s nights. They are simply not your logged custody nights. If you need a number that assigns every day to someone, that is a different exercise — usually a two-sided schedule or an attorney’s worksheet — not something a unilateral log should invent.

Why the same engine has to run everywhere

If the calendar says 86 nights, the dashboard must say 86, the statistics page must say 86, and the PDF must say 86 for the same period. Getting custody math wrong in court is not a UX issue. Custody Proof uses one counting engine for calendar, dashboard, statistics, and reports so a number you quote from one screen matches the exhibit.

If two screens disagree, refresh. If they still disagree, that is a bug — tell support both numbers and the period. Do not “fix” it by logging the night twice.

What this is not

• It is not a claim that every jurisdiction uses nights. Some orders talk in hours, in overnights, or in a specific worksheet. Follow the order.
• It is not child-support advice. Overnight counts often feed support conversations; the conversion is not something this page will do for you.
• It is not a reason to ignore day-time parenting. Day visits still go on the record. They just do not pretend to be nights.

How to log so the math stays boring

1. For a multi-night stay, set the end date to the return morning.
2. For a same-day visit, use timed visit and the real hours.
3. Do not log the same child-night twice. If a tool warns you about an overlap, believe it.
4. Confirm weeks that went as planned so the planned-vs-actual report has a complete denominator, not only the exceptions.

More detail on the actual forms: Adding custody time. How the screens display the numbers: Understanding your statistics. How this shows up in a packet: How to document custody for court. Ready to keep the math boring for your own record? Start with Custody Proof.

FAQ

Why does my 2-night weekend show 2 nights, not 3 days?

Because the unit is overnights. Friday night and Saturday night are two nights. Sunday evening is the return, not a night.

My count looks one short.

A stay’s end date is the morning it ends, so that date is not a night. January 1–11 = 10 nights.

Why didn’t my afternoon visit change my percentage?

Timed visits are tracked as visits and hours. They do not enter the overnight percentage.

I logged the night for both kids — why isn’t it counted twice?

Calendar nights are unique. One night with two children is one night of custody time. Per-child totals live in the by-child view and as labeled child-nights on reports.

Custody Proof documents your time; it does not interpret your order. How your jurisdiction counts custody for a legal purpose is a question for your attorney.

Custody Proof is a documentation tool, not a law firm. Nothing on this page is legal advice. Whether and how a record is used in a case is a question for your attorney.