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Go to website https://www.epochconverter.com/.
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Scroll to Epoch dates for the start and end of the year/month/day Section.
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Select Year radio button.
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Enter any date of the year of your selection.
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Select Local time.
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Click on Convert button.
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The year value will be Epoch time value for start of year times 1000.
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In sample illustrated below, the year value will be 1609477200*1000 = 1609477200000.