The tool on the page helps to calculate epoch clock time from hexadecimal timestamp and hex timestamp to the millisecond timestamp. Hex timestamp will be re-presented in seconds, milliseconds. Hex epoch timestamp in seconds, milliseconds and nanoseconds can be converted to date timestamp.
Year
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-Mon
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-Day
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:Min
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:Sec
A day is unity, or 1, and any fraction thereof can be shown with digits to the right of the hexadecimal separator. So the day begins at midnight with .0000 and one hexadecimal second after midnight is .0001. Noon is .8000 (one half), one hexadecimal second before was .7FFF and one hexadecimal second before next midnight will be .FFFF.
Also we have an other most useful tool which is used to calculate the date-time difference here.