Daylight planner

Let today’s daylight set your clock.

Your town, your wake time, today’s daylight. A personal schedule of light, meals and caffeine, computed for this very day, because the times change every day.

Your location is used on this device only, to compute daylight times.

This tool computes today’s sunrise, midday, UVB window and sunset for your town, then arranges your wake time, meals and caffeine around them. It runs in your browser and needs JavaScript switched on.The general shape holds for most people: bright outdoor light within an hour of waking, the last caffeine by early afternoon, dinner finished three hours before bed, and screens warm and dim after sunset. The guidance library holds the evidence for each.