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Free Online Julian Date Converter

Convert an ISO instant with explicit offset to astronomical Julian Date. This is a continuous day count, not the Julian calendar.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result



How to use Julian Date Converter
Convert an ISO instant with explicit offset to astronomical Julian Date. This is a continuous day count, not the Julian calendar.
  1. Set Text.
  2. Run the tool, review the result and its stated limitations, then copy or download if needed.
Example & practical use
Convert an ISO instant with explicit offset to astronomical Julian Date. This is a continuous day count, not the Julian calendar. The example below demonstrates Text.
Example input:
{
  "text": "2000-01-01T12:00:00Z"
}
Expected result (relevant fields):
{
  "julianDate": 2451545
}
Features & result limitations
Convert an ISO instant with explicit offset to astronomical Julian Date. This is a continuous day count, not the Julian calendar.
Frequently asked questions
What inputs does Julian Date Converter accept?
Text
How should I interpret the Julian Date Converter result?
Convert an ISO instant with explicit offset to astronomical Julian Date. This is a continuous day count, not the Julian calendar.
Where does Julian Date Converter process my data?
Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.