The MIT License (MIT) Copyright © 2016-2018 JUXT LTD. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Introduction
Time is an illusion. Lunchtime doubly so.
— Douglas Adams
The Hitchhiker's Guide to the Galaxy
The Hitchhiker's Guide to the Galaxy
Tick is a comprehensive Clojure(Script) library designed to make it easier to write programs that involve time and date calculations:
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Functions to manipulating time, easily and succinctly (stable)
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Powerful functions for slicing and dicing time intervals (stable)
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Implementation of Allen’s interval algebra (stable)
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Support for iCalendar serialization (work-in-progress)
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Scheduling (work-in-progress)
In many business domains, dates are as fundamental as numbers and strings. It’s often desirable to have date-heavy business logic portable across platforms. Tick supports both Clojure and ClojureScript, with an identical API.
Status
Tick is currently in alpha status. By alpha, we mean that the library’s API may change in future. The quality of tick is deemed adequate for real-world use but do let us know if you come across any unexpected behaviour and bugs.
License
Tick is copyrighted by JUXT LTD. and licensed as free software under the open-source MIT License.
Comparison to other time libraries
Java 8 time
Java 8’s java.time API is both influenced by, and an improvement on,
Joda Time.
Unlike older JDK dates and calendars, instances in
java.time are immutable so can be considered values in Clojure. For this reason, there is no reason to wrap these values. Consequently, there is full interoperability between tick and java.time. Where tick does not provide a part of java.time’s functionality, java.time can be called directly.
Because tick is built on java.time, Clojure programs must run on Java 8 or higher.
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clj-time and cljs-time
Most Clojure applications use clj-time which is based on Joda
Time. However, cljs-time is a wrapper over goog.date which in turn
is a wrapper over mutable JavaScript Date objects.
This works OK as a proxy for Instant, but is not a great foundation for local dates etc.
The author of cljs-time, Andrew McVeigh, has said he would ideally
move cljs-time off goog.date but is unlikely to do so at this
point. For one thing, there could be more than a few current users
relying on the JS Date nature of the cljs-time objects.
Taking a fresh look at the date/time landscape, we now have JSR-310 and implementations in both Java and Javascript and so it is possible to create tick, which combines the excellent JSR-310 with an expressive, cross-platform Clojure(Script) API.
Sometimes we can get away with just switching the clj(s)-time import for the compilation target, the fact that cljs-time doesn’t have complete fidelity with clj-time often leaks out.
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