Missing birth data is one of the most common obstacles to a reading, and it can often be resolved with the right records and context.
Birth time determines the Ascendant (rising sign) and the house structure, which is a large share of what makes a chart specific to you rather than to everyone born that week. Without it, some of the reading is still available and some genuinely is not.
Start with documents. Hospital records, birth certificates in some countries, baby books, immunisation cards and family letters all carry times more often than people expect. A parent remembering "just before the morning news" is more useful than nothing.
Where no record exists, astrologers use rectification: working backwards from well-dated life events to test which Ascendant (rising sign) and house placements fit. It is careful, slow work and it is never presented as certainty.
If you would rather not go through that, a reading based on your Moon and planetary positions alone is still substantive — it just describes your inner weather and timing more than the outer circumstances of your life.
Which parts of the chart need the exact time?
The rising sign changes roughly every two hours and the houses move with it, so those need the time. The Moon changes sign about every two and a half days, so the Moon sign is usually safe from the date alone, and the slower planets, Jupiter and Saturn especially, stay in one sign for a year or more. The Dasha sequence starts from the Moon's exact position, so its dates shift with the time, though the order of periods usually does not.
If your time is missing or approximate, say so when you book a reading, and we will tell you clearly which parts of the reading to take lightly.