Free check
Was summer time in effect when you were born?
Summer time can move your lagna. If you were born in the UK or US, the clock on your birth certificate may have been an hour ahead of standard time. Enter your birth details and this free check shows your chart with and without that hour, so you can see whether it changes your lagna.
Born in Britain between 1968 and 1971? Clocks there stayed an hour ahead all year. The check accounts for that.
How to use this tool
- Enter your birth date. Pick your date of birth in the form.
- Enter your birth time. Use the time on your birth certificate, in local time.
- Choose your birth city. Search for the city where you were born and pick it from the list.
- Press "Check my birth". You see whether summer time was in effect where and when you were born.
Enter your birth details to see whether summer time was in effect.
How the check works
The check shows your chart two ways. The first uses the clock time you entered with the summer-time rule that was in force in your birth city on that date. The second leaves the summer-time hour out, the way a chart comes out when the clock time is read as standard time.
If the two agree, we say so. If they differ, you see both side by side. The check shows both readings and does not say which one belongs to you.
Summer time was not the same every year
The dates moved several times. The US started summer time on the first Sunday of April for births from 1987 to 2006, and on the second Sunday of March from 2007. Britain kept clocks an hour ahead all year from February 1968 to October 1971. The tool uses the time-zone history for your exact birth date, not today’s rule.
Read the dated table with sources →Read more on this topic
- Why ChatGPT Gets Kundli and Vedic Dates Wrong : A large language model predicts plausible text, not astronomical calculation, so asking it for a planetary position or tithi can sound confident yet be wrong.
- Born in the DST Fall Back Hour: Which 1:30 AM? : When clocks fall back in autumn, one clock hour happens twice, and a birth certificate showing 1:30 AM can mean two different real moments. Check which applies.
- Indian Time Zones Before 1947: Bombay, Calcutta : Before India standardized to IST after independence, Bombay and Calcutta ran on their own local time, which matters for charting a grandparent's birth.
FAQ
Questions about summer time and birth charts
Why does one clock hour matter in a birth chart? +
A chart starts from the exact moment of birth in universal time. If the clock was an hour ahead of standard time and that hour is missed, the moment is off by an hour. The lagna moves to a new sign roughly every two hours, so an hour can change it.
Does India have summer time? +
Not today. A birth in India is taken at the standard offset of UTC+5:30, so this check reports no change. The time-zone history the check uses does include wartime clock changes in the 1940s.
How do I find out whether my kundli used summer time? +
Ask the maker which UTC offset it used for your birth. For a July birth in London, UTC+0:00 means the summer-time hour was missed, and UTC+1:00 means it was used. For a July birth in New Jersey, UTC-5:00 means it was missed and UTC-4:00 means it was used.
What if my birth time was during the night the clocks changed? +
One clock hour is skipped in spring and one is repeated in autumn. The check tells you when your time falls in either, and for the repeated hour it shows the summer-time reading and the standard-time reading.
Is this check free? +
Yes. There is no email gate, no sign-up and no payment step before the result.