For example, at the end of the day used in the examples above, the time representations progress as follows: On a normal UTC day, which has a duration of 86 400 seconds, the Unix time number changes in a continuous manner across midnight. Each leap second uses the timestamp of a second that immediately precedes or follows it. In Unix time, every day contains exactly 86 400 seconds. International Atomic Time (TAI), in which every day is precisely 86 400 seconds long, ignores solar time and gradually loses synchronization with the Earth's rotation at a rate of roughly one second per year. UTC includes leap seconds that adjust for the discrepancy between precise time, as measured by atomic clocks, and solar time, relating to the position of the earth in relation to the sun. Unix time differs from both Coordinated Universal Time (UTC) and International Atomic Time (TAI) in its handling of leap seconds. This can be misleading since Unix time is not the only time system based on an epoch and the Unix epoch is not the only epoch used by other time systems. Unix time is sometimes referred to as Epoch time. Every day in Unix time consists of exactly 86 400 seconds. For example, 00:00:00 UTC on 1 January 1969 is represented in Unix time as −31 536 000. Negative values indicate times before the Unix epoch, with the value decreasing by 1 for every non-leap second before the epoch. For example, 00:00:00 UTC on 1 January 1971 is represented in Unix time as 31 536 000. The Unix time 0 is exactly midnight UTC on 1 January 1970, with Unix time incrementing by 1 for every non-leap second after this. Unix time is typically encoded as a signed integer. Unix time is currently defined as the number of seconds which have passed since 00:00:00 UTC on Thursday, 1 January 1970, which is referred to as the Unix epoch. It has come to be widely used in other computer operating systems, file systems, programming languages, and databases. Unix time originated as the system time of Unix operating systems. In modern computing, values are sometimes stored with higher granularity, such as microseconds or nanoseconds. It measures time by the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, the Unix epoch, without adjustments made due to leap seconds. Unix time is a date and time representation widely used in computing. It was celebrated in Copenhagen, Denmark at a party held by the Danish UNIX User Group at 03:46:40 local time. To me, this is just one in the land of many examples of how Groovy makes programming in Java fun.Unix time passed 1 000 000 000 seconds on. name // println timestamp // 08:00:00.00 println timestamp. toTimestamp () println now // Mond Apr 10 08:00: println now. def now = new Date () def timestamp = now. No extra libraries needed and I don't have to remember what a timestamp format looks like. If you print out the class names you will also see that it's not just converting it into a formatted string but an actual timestamp object. Groovy adds a convenient method to all Date objects for converting a date to a timestamp. If you haven't already played around with Groovy it seems to remove the annoyances of Java by adding on to the API. Luckily I am using Groovy on this project. SimpleDateFormat Date now = new Date () SimpleDateFormat timestamp = new SimpleDateFormat ( " yyyy-MM-dd HH:mm:ss " ) // 08:00:00 println timestamp. Not the hardest thing in the world to do but certainly something I don't care to do. With this simple Java example, we need to bring in another package to do formatting, create a formatting object with the correct pattern and then format our date. I need to stick this date/time into a timestamp column and to do so in most languages you need to format this so it matches up to what a timestamp column expects. The problem with this (and the same goes for other languages) is that you can't insert that value into a timestamp column. It's pretty darn easy in most languages to grab the current date/time and in Java, you can do so just by creating a new instance of the Date class. I am working on a project where I am using straight SQL to insert a record into a database using Groovy. Lucky for us, Groovy makes it super simple to work with dates. Working with Dates in any language is one of those core fundamentals you need to know right away. Inserting a Groovy Date into a Time Stamp Column
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