Select a start date for calculating the 70 weeks. If the year selected occurs in the Cyrus era (6th century BC), the day and month are ignored, and the first section of 7 weeks is calculated as leap years, or years of 13 months, in the Hebrew and Babylonian calendars. There are 7 of these leap years in a span of 19 years, a period that became known as the Metonic cycle. 19 years would be "week" of leap years. The second section of the 70 weeks is calculated as 62 weeks of 7 years, including both regular years and leap years. The end of the second section of the 70 weeks points to the time of the appearance of Christ, when he began his ministry.

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time and date.com

Fourmilab calendar converter

Calendar Converter

Hebcal Interactive Jewish Calendar

Did Daniel predict the exact time of Christ's coming?
From The Prophecies of Daniel, by Allan A. MacRae 1991