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1.0.6 • Public • Published

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

Also works in a browser

License Downloads per month downloads per month Contributions welcome Known Vulnerabilities


  • 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.


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.


To add a timed job every day at noon:

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):

<year> <month> <day> <hour> <minute> <second> <millisecond> <microsecond> ...

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:

@<epoch>[.<faction of second>]
Field syntax: [!][-]<value>[-<value>]|[,<value>] | /<value> | *
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


  • 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

Examples og timer expressions:

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


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

where id is the value returned from timexe

Returns a result object:

  result: “ok” or null
  error:  A failure explanation or null

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.


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


$ npm install timexe


var timexe = require('timexe');

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

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

With HTML & javascript


Copy files to folder.


<script type="text/JavaScript" src="timexe.js"></script>
// Add
var res1=timexe(* * * 12, function(){alert(“hello wolrd”)});

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

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


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.


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.


npm i timexe

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  • paragi