Timexe - A Cron-like Timer and scheduler witn milliseconds resolution

Also works in a browser


$3

* Milliseconds resolution
* Improved cron-like syntax
* Recalculate long running timers, to improve accuracy
* No dependencies
* Works both for node JS and browser inclusion
* Time expressions include ranges, sets, timestamps, weekdays, yeardays and more
* Battle-tested. Very reliable.

$3

At present it seems to have an accuracy within 2 ms in node and up to 25 ms i most browsers.
It seems that execution is defered somewhat during process load.

$3

To add a timed job every day at noon:

``javascript
timexe(” * 12”, function(){console.log(“hello - it is noon again”)});
`

The time expression syntax is like cron, but in reverse order: starting with year, month... (where as cron start with minutes, hours...) plus some enhancements.

Time expression Syntax

---
The basic syntax is a series of fields specifying the time(s):

...

or a time stamp.

Each field contain wild-cards, ranges, sets, not flags and every flags. Plus some special flags for year days and week days.

The epoch timestamp is seconds since 1970-01-01 UTC with fractions of second as decimal part:

@[.]

##### Field syntax: [!][-][-]|[,] | / | *
`
space : field separator
* : all values. Flags will be ignored.
! : not
/ : every (can not be combined with ! and range)
- : Negative values are counted back from the maximum value
a-b : range. both a and b included.
a,b : set of values

Day field can have the one of the following flags as well
y: day of year
w: day of week 1-7 (1 is Monday)
`
Unspecified minor fields are assumed to have the lowest possible value

Note:

- Time expression are in local time where as time stamps are in UTC
- Month and weekday use another offset then the javascript Date function:
- Month 1 is January
- Week day 1-7 starting with Monday

$3

| Time | Time expression |
| --- |:---|
| Every hour | \ \ \ \ |
| Every day at noon | \ \ \* 12
| Every 3th Hour on work days | \ \ w1-5 /3
| Once at a specific epoch time |@1422821601.123
| Once at a specific time | 2014 5 13 18 53 7 300 230
| 2th to last day of the month at noon | \ \ -2 12
| 3th last day of the year | \ \ y-3
| 3 times an hour during work time | \ \ w1-5 9-17 0,20,40
| Every morning at 7:30 but not on weekends | \ \ !6-7 7 30
| Every 10 minutes in the day time | \ \ \* 8-18 /10

API

---
##### timexe(timeExpression, callBack [,parameterToCallBack])

Returns a result object:
`
{
result: “ok” or null
error: A failure explanation or null
id: integer used to identify the timer
}
`


##### timexe.remove(id)
where id is the value returned from timexe

Returns a result object:
`
{
result: “ok” or null
error: A failure explanation or null
}
`


##### timexe.get([id])
where the optional id is the value returned from timexe

Returnes either a timexe timer object if id is given, or an array of all active timer objects.




$3

##### timexe.timeResolution (integer)
This is the minimum time resolution for an expression. Minimum value is 1 ms. default is 2 ms.
This should be more the the execution time and delays do to load, of the intepreter.

##### timexe.maxTimerDelay (integer)
Maximum run time of a setTimeout call. Some javascripts engines cant handle more then 32 bit = 0x7FFFFFF. thats about 28 days. default is 86400000 = 1 day.
When this time have elapsed, the time expression are reevaluated.

With node JS

---
#### Install
`bash
$ npm install timexe
`
#### Use
`js
var timexe = require('timexe');

// Add
var res1=timexe(” * 12”, function(){console.log(“hello wolrd”)});

// Remove
var res2=timexe.remove(res1.id);
`




With HTML & javascript

---
#### Install
Copy files to folder.

#### Use
`html


``

Change log

1.0.5 Added types for typescript

1.0.3 Bugfix: mismatched ID

1.0.2 Temp bugfix of mismatched ID.

1.0.1 Documentation

1.0.0 Fixed test cases:

"Cascading carry" failed

"Only Wildcards = every hour" failed

Documentation

0.9.19 Bug fix. failed when "processs" undefined

0.9.18 Documentation update.

0.9.14 A quick code review. No bugs repported for 2 years.

0.9.13 Minor changes to timex.js

0.9.12 Minor changes to comments and reamne.md

0.9.11 Minor changes to comments and reamne.md

0.9.10 Adapted example to runkit

0.9.9 Minor bugfix. timexe.list made into a regular array.

#### Help
Please don't hesitate to submit an issue on github! It's the only way to make it better.

But please be prepared to present a test case.

Contributions of almost any kind are welcome.