Is `System.currentTimeMillis()` correct across multiple processes?

We have a situation where a master process writes to a log. It then spawns multiple worker processes which write to their own logs. (I wanted the workers to log through the master, but there was …

Date parsing in Java using SimpleDateFormat

I want to parse a date in this format: “Wed Aug 26 2020 11:26:46 GMT+0200” into a date. But I don’t know how to do it. I tried this: SimpleDateFormat parser = new SimpleDateFormat(“EEE …

How to parse time in any format with LocalTime.parse?

I am having trouble using java’s LocalTime to parse a string with hours, minutes, and seconds. LocalTime t = LocalTime.parse(“8:30:17”); // Simplification This throws the following exception: …

How to convert mm/dd/yy string to “Monday 7th Jan”

I have a database file with mm/dd/yy values for events, and I want to display the date as something similar to “Day(word), day(number), month(word)”. 01/07/19 into Monday 4th Jan or Monday 4 Jan or …

Issue Converting seconds to HH:MM:SS java

I have a long variable which represents the downtime of an application in seconds. I want to display the downtime as HH:mm:ss Long downTime = 755; Date newD = new Date(downTime * 1000); When …

Convert seconds into T1H15M5S (ISO_8601)

I would like to convert a number of seconds into ISO_8601/Duration in Java. http://en.wikipedia.org/wiki/ISO_8601#Durations Are there any existing methods to do it that are already built in?

Wrong time calculated in minutes from two Date objects to calculate duration

I am trying to calculate the duration between two date objects in minutes. I have found some inspiration during my research from this stackoverflow question. In generally this seems to work correct, …

How to know if now time is between two hours?

I have a now time: new Date(); And I have some hour constants, for example, 23 and 8 (it’s 11pm or 23:00, 8am or 08:00). How I can know is now time between it’s two hour constants? It need to run …

How to convert UTC time into local time in Java?

I have time coming from gpslocation service in 1352437114052 format. Can some one tell me how to convert this into local time either in Java or Matlab or Excel.

In Java, what is the fastest way to get the system time?

I’m developing a system that often use the system time because the Delayed interface. What is fastet way to get the time from system? Currently I’m using Calendar.getInstance().getTimeInMillis() …