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    1.0.5 • 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

    1.0.3 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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