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I have a string with a date format such as
Jun 13 2003 23:11:52.454 UTC containing millisec... which I want to convert in epoch. Is there an utility in Java I can use to do this conversion?
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In a computing context, an epoch is the date and time relative to which a computer's clock and timestamp values are determined. The epoch traditionally corresponds to 0 hours, 0 minutes, and 0 seconds (00:00:00) Coordinated Universal Time (UTC) on a specific date, which varies from system to system.
The constructor of the Date class receives a long value as an argument. Since the constructor of the Date class requires a long value, we need to convert the Timestamp object into a long value using the getTime() method of the TimeStamp class(present in SQL package).
You can take an epoch time divided by 86400 (seconds in a day) floored and add 719163 (the days up to the year 1970) to pass to it. Awesome, this is as manual as it gets.
This code shows how to use a java.text.SimpleDateFormat to parse a java.util.Date from a String:
String str = "Jun 13 2003 23:11:52.454 UTC"; SimpleDateFormat df = new SimpleDateFormat("MMM dd yyyy HH:mm:ss.SSS zzz"); Date date = df.parse(str); long epoch = date.getTime(); System.out.println(epoch); // 1055545912454 Date.getTime() returns the epoch time in milliseconds.
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