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Enter the date the first egg was laid. Get every date that follows: when to candle, when to expect the hatch, when the ringing window opens and closes, and when the chick is ready to sell.
Fertile eggs show a network of blood vessels against the light. Candle earlier and you get an unclear result and disturb the hen for nothing.
The window is four days wide. Too early and the closed ring slips off. Too late and the foot will not pass through. This is the date worth setting an alarm for.
Selling before a chick feeds itself reliably is how buyers lose birds and you lose a customer. Wait for the eating, not the calendar.
Fischer's lovebird eggs hatch about 23 days after incubation begins. Budgerigars take about 18 days, cockatiels about 21. Incubation usually starts with the second or third egg, so the clutch hatches over several days rather than all at once.
Day 7 to 10 after incubation starts. Fertile eggs show visible blood vessels against a light. Candling before day 7 gives an ambiguous result and disturbs the hen for no benefit.
Between day 8 and day 12. Earlier and the ring slips off, later and the foot is too large to pass through. Four days is a narrow window, which is exactly why it is worth calculating rather than estimating.
Four to six for Fischer's lovebirds, laid on alternate days. Fewer than three or more than seven is worth noting against that pair, since it tends to repeat.
Once it is fully weaned and feeding itself reliably, typically week 8 to 10. The calendar date is a guide; the actual test is watching it eat unaided for several consecutive days.
Start a pair and the KinBird calendar shows its expected lay, candling, hatch and weaning dates. Each clutch and egg is tracked on the Breeding page. No spreadsheet, no mental arithmetic.