![unix epoch time converter unix epoch time converter](https://www.drupal.org/files/project-images/Date_to_timestamp.png)
![unix epoch time converter unix epoch time converter](https://i.ytimg.com/vi/DXPkCxTUXSw/maxresdefault.jpg)
When this approach is used, my preference is to always store UTC/GMT times. In Java or Groovy development, it is easy to save dates and times in the database as such, but it can also be effective to simply store the integer representing the time since epoch in the database. One can use one of these approaches to get a UTC/GMT representation of the time. There are ways to address this in Java such as using tTimeZone(TimeZone) or tTimeZone(TimeZone). The Groovy example shows MST time rather than GMT. As the image indicates, coercion to a long is vital to perform the conversion correctly. The effect of this is shown in the next screen snapshot where the numeral by itself is shown leading to the wrong time and using the more traditional Java approach of coercing the numeral to a long with the "L designation. The Groovy coercion to a long is also necessary so that the numeral is not treated as an int, leading to the wrong time. First, there was the obvious need to multiply the Unix number by 1000 to get from seconds to milliseconds. There were some minor things that needed to be done to convert the number used for Unix seconds since epoch to Java/Groovy's milliseconds since epoch.
#Unix epoch time converter code
The inline Groovy code was fairly simple and is shown again here: println new Date((1310724379 as long)*1000) The code for the above was so simple that I was able to invoke it simply via the command line Groovy launcher with the -e option. This is shown in the next screen snapshot. It's really easy to calculate the same time in Groovy from that integer. The next screen snapshot shows the number of seconds since Unix epoch time for that last time that page was updated.Īs the image above indicates, the integer 1310724379 represents " 10:06:19Z." This is also shown with the online Epoch Converter as shown in the next screen snapshot. In short, the typical conversion is to multiply Unix's seconds since epoch by 1000 to get Java's milliseconds since epoch or divide Java's milliseconds since epoch by 1000 to get Unix's seconds since epoch. The most important thing to keep in mind when converting between the two is that Unix APIs tend to use seconds since the epoch time while Java's APIs tend to use milliseconds since that same epoch time. The documentation states, "A milliseconds value represents the number of milliseconds that have passed since Janu00:00:00.000 GMT" while documentation on the constructor accepting a long states, "Allocates a Date object and initializes it to represent the specified number of milliseconds since the standard base time known as "the epoch", namely January 1, 1970, 00:00:00 GMT." The documentation also goes into a discussion of the subtle differences between GMT/UTC/UT.īecause Java (and Groovy) base their date/time APIs ( Date, Date, and Calendar) off of the same epoch starting time as Unix, it is easier to deal with dates and times when writing Groovy scripts in a Linux environment. The Javadoc documentation for both of Java's standard "Date" classes ( and ) talk about the significance of that date. Java and Unix both use midnight, JanuUTC/ GMT as their epoch time. I have several times appreciated the fact that Java (and by extension, Groovy) base time against the same epoch as Unix. I like many of Mikulic's recommendations because I feel that conventions and standards can keep the intricacies of working with time zones, Daylight Saving Time, and leap seconds/ leap years somewhat manageable.
#Unix epoch time converter software
This post and its popularity was reminder to me of how often I find myself dealing with dates and times in software development and especially when writing scripts. It references the original Emil Mikulic post Time and What Programmers Should Know About It.
![unix epoch time converter unix epoch time converter](https://konnen-no.com/hebear/ddqDMCGjaTL3g2Aj2JQngQHaDr.jpg)
The link What Every Programmer Should Know about Time was recently posted on DZone and was a highly popular link.