'XML Call backup file date format

Hello guys could anyone help me to understand how to read the date from xml file i read i got it from an xml file .

<CALL_RECORDS _id="2463" number="0000000000" duration="0" type="2" date="1625000807857" name="Persone" numbertype="2" numberlabel=" " ring_time="0" new="0" countryiso="MA"/>

i couldn't read or understand how the date is written



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