Moon Phase Calculator
Enter any supported date, exact local time, and IANA time zone. The result includes previous and next new Moon, first quarter, full Moon, and last quarter events.
Browser Moon phase software for exact dates and times
Calculate the Moon state for a precise local instant, including phase angle, illumination, lunar age, and adjacent principal phases. The supported year range is 1900 through 2100.
Calculate an exact instant
Two focused browser tools
Desktop Lunar Calendar
Inspect a compact monthly technical grid with a noon Moon state for each day and exact local times for the month's principal events.
Calculation basis
Inputs are converted from the named time zone to UTC before the astronomical calculation. Read the calculation methodology and the reference sources for scope and limits.
Need a calendar-oriented and printable monthly product instead? Visit the contextual UK Moon Calendar.
Canonical site: https://moonphasesoftware.com