Be careful when falling back to Date constructor #1407

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ichernev opened this Issue Jan 9, 2014 · 136 comments

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@ichernev
Contributor
ichernev commented Jan 9, 2014

If you clicked on the warning link and landed here:

moment construction using a non-iso string is deprecated. What this means is you can safely do

> moment("2014-04-25T01:32:21.196Z");  // iso string, utc timezone
> moment("2014-04-25T01:32:21.196+0600");  // iso string with timezone
> moment("2014 04 25", "YYYY MM DD"); // string with format

but you can't do reliably (therefore its being deprecated)

> moment("2014/04/25");
> moment("Thu Apr 24 2014 12:32:21 GMT-0700 (PDT)");
> moment("some random string that looks like date");

In the upcoming releases a few more well defined formats might be added, but the general idea of using any random string to construct a date is no more. If you really want that behavior just do moment(new Date("random string that contains date")), but moment won't be responsible for such convertions. Read below for the rationale about the change

As described in #1403 (comment), but also recent debugging c4d9f6e and 94d6c90 caused by https://travis-ci.org/moment/moment/builds/16672288 brings me to the conclusion that

using Date to create a moment from string, passed from the user is extremely unpredictable, and it turns out to work somewhat and then bite you in an edge case when you're not careful

So I think we need an option to disable it, for tests at the very least. I've debugged that numerous times thank to our old friend IE6 and friends.

You'd pass a string only, hoping that it would hit one of the predefined formats, but instead it hits Date and it sort-of works, sometimes. I think it should be clear to users when they're hitting this case, and that it might not work well on all browsers.

The only use-case for using Date to parse input is when a) it is entered by a web user (moment's user's user :)) and b) the web user can see how we're interpreting the date entered. Every other case is just silently waiting to break at some point.

@icambron
Member
icambron commented Jan 9, 2014

+1. I totally agree. We should start issuing a deprecation warning right away. Some additional support:

  • That a string might go into the Date constructor or the ISO parser is ugly and confusing
  • The most reliable way of using the Date string constructor was always new Date('2014-01-01'), which is now handled by the ISO parser anyway (i.e. moment('2014-01-01') doesn't use the Date constructor anyway).
  • I'm pretty sure the constructor works differently in different locales for the same browser. E.g. new Date("05/06/2014") is May 6 in American browsers but June 5 in English browsers. So even if you test all your browsers, did you test all your locales? It's terrible for us to even pretend this stuff works.
  • If you really want to use the date constructor, you can always just use the date constructor and pass the date into Moment.
  • We could make moment(string) extensible, and then someone could create a plugin that either uses a list of well-known formats or just the Date constructor to parse them.
  • If we remove the Date constructor fall-back, we can actually make the ISO parser less strict, since it won't be preempting a better parse. So that's a win too.
@ichernev
Contributor

The idea I liked most is for extensible constructor -- even if we disable Date parsing in moment, we should make it easy for people to migrate.

So lets do this:

moment.createFromInputFallback = function(config) { config._d = new Date(config._i); };

And call this method in the else clause of makeDateFromInput. In 3.0 we'll just remove this function, or place it under another name, so that one can just assign to the preset.

For tests right now, we can put a different function that throws an exception if called. I hope that would work just fine.

Inside we can print using console.warn (would go to stderr in node), only the first time it is called (like global deprecation) -- this is to let users know what awaits them.

@ichernev ichernev added the todo label Feb 6, 2014
@bbraithwaite bbraithwaite added a commit to flyvictor/victor-node-lib that referenced this issue Apr 22, 2014
@bbraithwaite bbraithwaite initial dev. Also updated existing logic re: depreciation Please refe…
…r to moment/moment#1407 of constructing new moment using strings
cf51b94
@st3fan
st3fan commented Apr 23, 2014

I don't understand this deprecation warning. I am using moment.js as documented, in an Angular.JS filter:

app.filter('scanDate', function() {
    return function(input) {
        var m = moment(input);
        return m.format("dddd, MMMM Do YYYY");
    };
});

Where input is an ISO formatted date string.

What do I need to do different to deal with this future deprecation?

If this deprecation warning is for the developers of this library and not for the users of it then I am going to suggest to remove it.

@icambron
Member

@st3fan Are you sure it's an ISO-formatted string? Moment is claiming that it isn't; it's saying that it can't parse it, and it is instead resorting to passing the string to new Date(s), which happens to work. That's the feature we're removing and are warning you about. In the future, it will fail. Your options are:

  1. Ensure that the input really is ISO-8601 compliant (and file a bug if you think it is but are getting the warning anyway)
  2. Parse the input explicitly using moment(input, string)

The warning is very much for you :)

@icambron
Member

This is implemented, so I'm closing it.

@icambron icambron closed this Apr 23, 2014
@Meekohi
Meekohi commented Apr 25, 2014

If we deprecate everything in Javascript that doesn't work on a side-case there will be no features left. ;) Looking forward to at least a few other "sane" date formats being added back in. Explicitly creating a Date or including the format string removes a lot of Moment's elegance.

@icambron
Member

@Meekohi We'll always allow ISO strings like '2013-05-10', which IMO everyone should just use. As for other strings, '05/10/2013' works differently in different locales, and most of the rest don't work across browsers. These aren't really side-cases; we receive an awful lot of support tickets here about surprises from things like moment("1.10.2014") where the user is expecting us to parse it consistently.

We are allowing this to be pluggable, so you can override the fallback parser (i.e. the thing currently giving a deprecation warning and then using the native parser) to do anything you'd like, and I suspect there will be some plugins built that do just that.

@Meekohi
Meekohi commented Apr 28, 2014

@icambron Is the correct way to plugin your own parser to overwrite createFromInputFallback? i.e.

moment.createFromInputFallback = function(config) {
  // unreliable string magic, or
  config._d = new Date(config._i);
};
@icambron
Member

@Meekohi Correct.

@aredo
aredo commented Apr 29, 2014

hi guys,
i'm use moment on my node apps.
i using it something like this one

moment(Date('2014-04-21T05:29:59Z')).format("DD-MM-YYYY")

now when i check log on my server, i get error message on my log files

Deprecation warning: moment construction falls back to js Date. This is discouraged and will be removed in upcoming major release. Please refer to https://github.com/moment/moment/issues/1407 for more info.
@icambron
Member

@aredo I think you're expecting Date(string) to return a Date? It appears to return a string. I think you want moment(new Date(string)) or moment(Date.parse(string)), or even just moment('2014-04-21T05:29:59Z')

@thomasbird1984

I'm using an iso 8601 format like this: 2014-04-29 17:47:12, is there a list of the supported formats that will not be deprecated?

@icambron
Member
icambron commented May 1, 2014

(Editing because I misunderstood the question and this is kind of an important doc now). @godoploid Only ISO 8601 are asp.net-JSON-style dates are not deprecated. On your specific format, that isn't ISO-compliant. Use a "T" instead of a space, as in "2014-04-29T17:47:12" (see here).

@thomasbird1984

@icambron Got it thanks, I'll make sure to do so!

@imsobear

@icambron
But how I format the current time?

When i try this var now = moment().format('YYYY-M-D'), it warning me: moment construction falls back to js Date. This is discouraged and will be removed in upcoming major release. Please refer to https://github.com/moment/moment/issues/1407 for more info.

@ichernev
Contributor

@imsobear I'm not sure the error message you see is from moment().format('YYYY-M-D'), I think its something before that.

@favio41
favio41 commented May 16, 2014

The documentation have a example that throws this Deprecation message.

Yeah I know, there is "warning" text, but if is for remove, maybe some "Deprecation" in the docs, could help the newbies.

moment("Dec 25, 1995")  -> "moment construction falls..."

http://momentjs.com/docs/#/parsing/string/

@kmalakoff kmalakoff referenced this issue in vidigami/backbone-http May 21, 2014
Closed

Address moment deprecation warning #3

@glasnt glasnt added a commit to machiavellian/machiavelli that referenced this issue May 23, 2014
@glasnt glasnt Correct formatting and validation for absolute time
moment.js deprecation warning and related issues: moment/moment#1407
5a57a13
@billie66 billie66 referenced this issue in limingth/ppweb May 26, 2014
Closed

下午 9:30,应该是晚上 #62

@ideag ideag referenced this issue in ideag/gust Jun 5, 2014
Closed

Invalid Date #34

@elliotf
Contributor
elliotf commented Jun 11, 2014

Hello nice folks. I came here via the deprecation link and am totally fine with having moment not try to parse garbage. I found this while writing a test to make my code check for .isValid().

What is the recommended way of disabling this warning?

@matthew-dean

Ugh. Postgresql native date types are no longer supported because of this?

@RichardJohnn

@matthew-dean && @elliotf ,

moment.createFromInputFallback = function(config) {
  // unreliable string magic, or
  config._d = new Date(config._i);
}; 

via @Meekohi's comment is how to put the old behavior back in for now.

@ichernev
Contributor

@matthew-dean can you please be more specific? What date format do you want parsed? Also if you know that this comes from postgresql I'd really suggest writing a proper format and using it when you want to parse it. This approach is far superior, and this is why we're deprecating the Date fallback in the first place.

@matthew-dean

Sorry, forgot to update this. Bad form. It was neither Moment nor Postgresql date formats, but the incorrectly-written gist (of someone else) I was basing some code on that used the two.

@skinnybrit51

Sorry if I have miss understood something here but I just want to be clear on how isValid() is working.

Current version moment('2014 05 12').isValid() // true + warning message
Next major version moment('2014 05 12').isValid() // false + no warning message

This correct?

@icambron
Member

@skinnybrit51 Correct

@jough
jough commented Jul 22, 2014

So now moment throws a warning when it tries to parse its own created dates if they're saved to a string?

localStorageService.set('now', moment());
var now = localStorageService.get('now');
moment(now).isValid(); // <-- false? (e.g. "2014-07-22T16:33:18.097Z")

Any ideas?

@icambron
Member

@jough That's a good point; we ought to be able to parse our own toString format. @ichernev what do you think? We could make toString() just ISO or we could support the format explicitly.

@ichernev
Contributor

We use Date's toString, we should be able to parse that. Its an rfc I linked in the parsing issue #1686

@tsouza
tsouza commented Jul 24, 2014

What about number as string? Shouldn't it be parsed as milliseconds?

@ichernev
Contributor

@tsouza if you know its a number why don't you convert it first. Storing a numeric timestamp in string doesn't look like something we want to encourage. Just do moment(+string_containing_number).

@tsouza
tsouza commented Jul 25, 2014

Well, what about if I don't know if it's a number? One great feature of momentjs is that it can convert anything that is convertable to a date.

@Synchro
Synchro commented Aug 1, 2014

I'm getting this deprecation notice too, but I'm never providing a date without an accompanying format string. If it's that the supplied date string doesn't match the format, I would expect a different error, no?

@icambron
Member
icambron commented Aug 1, 2014

@Synchro correct, you should never get that message if you always include a format string. Can you provide a reproduceable example?

@dandv
Contributor
dandv commented Aug 5, 2014

I get this error in our production app but without a line number, it's very hard to pinpoint what exactly generates the error. We use the live-timestamp Meteor package, so maybe that's the culprit, but who knows? Or maybe there's no incorrect usage of non-ISO date formats.

Can moment please complain about specific instances of this deprecated usage?

@Y--
Y-- commented Aug 5, 2014

If you can reproduce the message on your development / testing environment, you can use something like this to temporarily transform console.warn and get the stacktrace of the message :
console.warn = console.trace.bind(console);

@dandv dandv referenced this issue in mattbradley/livestampjs Aug 5, 2014
Open

Annoying moment.js deprecation warning #25

@dandv
Contributor
dandv commented Aug 5, 2014

Thanks @Y-- - turns out that the livestamp js library has this issue.

@dandv
Contributor
dandv commented Aug 5, 2014

@ichernev: shouldn't there be a deprecation warning in the docs at http://momentjs.com/docs/#/parsing/string/?

@WhatFreshHellIsThis

I agree with @dandv , this should include a file/line number message such as this deprecation warning from express.js:

express deprecated res.json(status, obj): Use res.status(status).json(obj) instead api/controllers/view-controller.js:77:20

In very large complex projects it's hellacious to find where this is coming from otherwise.

@ichernev
Contributor
ichernev commented Aug 6, 2014

@dandv we need to put something there. The problem is we haven't yet figured out how to make the new api in a way that will break the least amount of users, is more flexible and still lets you do the old stuff. The current proposal is: #1686

@WhatFreshHellIsThis we need some call stack hacks to figure that out. It won't work on some restricted environments (browser plugins), so I'm not very excited. I'd merge a PR if it looks solid (shouldn't crash in any case), and is not a lot of code. It might need to traverse the stack until it finds the first non-moment code -- in minified code that is not possible (one issue OTOH).

@mitar
mitar commented Aug 16, 2014

So why parsing of "Thu Apr 24 2014 12:32:21 GMT-0700 (PDT)" is deprecated? I would love that formats which are non ambiguous are still automatically parsed. Those which are (day/month/year vs. month/day/year) are understandable to have issues and one might not want to parse it automatically (but there could be on option about preference). I am using Moment to parse dates which I get in various formats from external sources and I do not know which all formats they will be in. For non ambiguous formats I would love to get them parsed automatically. For ambiguous formats I should tell which one I prefer. For garbage it should throw an error or something.

@matfin matfin added a commit to matfin/cv.mattfinucane.ie that referenced this issue Aug 17, 2014
@matfin matfin Fix for deprecated moment.js date constructor. 6f2e276
@bevacqua

👍 to what @mitar just said

@icambron
Member

@mitar The problem is that that's not actually how Moment works. When it's parsing a string like "Thu Apr 24 2014 12:32:21 GMT-0700 (PDT)", it is just passing that string to the Date constructor and using the date that comes out. There are some formats that work on all browsers, some that work on some browsers but not others, and of course many perfectly unambiguous ones that work on no browsers. Moment doesn't know the difference between those formats. The Moment interface doesn't do a good job of making that clear and that leads to a lot of confusion about what will work where, so we've deprecated it.

See #1686 for the explicit API we plan to implement to make this both clear and convenient. And you can always do moment(new Date(whatever)) if you're confident the string is parsable by the constructor; that's all Moment was doing for non-ISO strings anyway.

@mitar
mitar commented Aug 19, 2014

OK, but then I must say that I was completely misusing the Moment for all this years. The main reason for me why I was using Moment was because I believed it does a better job than Date. I thought that the main purpose of Moment is to parse such dates. That it tries various formats and that it knows how to parse more than what Date was parsing. Are you sure this was not a feature in the past?

@icambron
Member

@mitar It tries ISO-8601 explicitly, and if that fails, it falls back on the date constructor. As far as I know, that's always been how it works, and we've long encouraged users to use explicit parsing strings where possible. So your confusion is exactly what we're aiming to fix with this deprecation :)

@jwalton
jwalton commented Aug 19, 2014

In reference to what @mitar said above, it would be very nice if moment(moment().toString()) was supported. I'm not sure if this means parsing the JS date format, or changing the toString() of moment, but it would be nice. :)

@jwalton
jwalton commented Aug 19, 2014

Well... I suppose moment(moment().toISOString()) isn't a terrible compromise...

@icambron
Member

@jwalton I generally agree (see my comments higher up in this ticket). We could try the toString format explicitly. If we left the end open, that should also work for new Date().toString() (i.e. the string used by @mitar). The native date toString() format is actually not defined by the spec but it will mostly OK in practice if we ignore the TZ abbreviation at the end. It's a bit more complicated than that because of localization, but it's likely that something could be made to work.

@imjared imjared added a commit to imjared/react-input-calendar that referenced this issue Aug 24, 2015
@imjared imjared Few changes
- require date string of MM-DD-YYYY per moment issue moment/moment#1407
- allow a way to access value via getValue() on the Calendar component
- if we open the calendar when the text field is focused, we hide it on blur
0326069
@wesleifreitas wesleifreitas added a commit to wesleifreitas/px-project that referenced this issue Aug 25, 2015
@wesleifreitas wesleifreitas fix(px-data-grid): remover Deprecation warning: moment construction f…
…alls back to js Date.

Ajustar função de formatação de data utilizando moment.js para remover do console do navegador a seguinte mensagem: Deprecation warning: moment construction falls back to js Date. This is discouraged and will be removed in upcoming major release. Please refer to moment/moment#1407 for more info.
Error[...]
42896e5
@Radagaisus

Is there a way to silence this warning? It's driving me insane.

@brunocoelho

@Radagaisus What about this?

screen shot 2015-09-08 at 15 40 58

@Radagaisus

@brunocoelho Thanks! Do you know of a way to silence it in Node.js? Our tests output are spammed with these warnings.

@jsilverMDX

Fork the library, search the text. Disable the output. Then use your fork.
Is what I recommend.

On Tue, Sep 8, 2015 at 1:23 PM, Almog Melamed notifications@github.com
wrote:

@brunocoelho https://github.com/brunocoelho Thanks! Do you know of a
way to silence it in Node.js? Our tests output are spammed with these
warnings.


Reply to this email directly or view it on GitHub
#1407 (comment).

@brunocoelho

@Radagaisus I'm afraid not, I don't use Node.js that much.

@jsilverMDX And remembering to merge with the original one every time a new version is released? I don't think it's a good idea.

@stuartpb stuartpb added a commit to stuartpb/stuartpb.com that referenced this issue Sep 21, 2015
@stuartpb stuartpb Explicitly construct date to avoid moment/moment#1407 warning ad90a53
@pmolaro
pmolaro commented Sep 24, 2015

For what its worth, I was getting the same warning and was initially confused at why I was getting it. After reading through several of the comments here and some trial and error, this seems to work for me, and I no longer get the error. So moving forward, is this the way moment intends for us to pass in dates? It seemed more useful to have it handling that for users:

return (moment(new Date(data)).isValid() ? moment(new Date(data)).format('MM/DD/YYYY h:mm A') : ' -- ');

In the example above if I have a valid date, I format that, otherwise I return 2 dashes as a placeholder. So "September, 22 2015 17:17:33 -0400" gets converted to "09/22/2015 5:17 PM"

@cspotcode

@pmolaro: Moment can do that, too. You just need to give it a format string. For example:

var d = moment(data, 'MMMM Do YYYY, h:mm:ss a'); // don't forget your format string
return (d.isValid() ? d.format('MM/DD/YYYY h:mm A') : ' -- ');

You can specify an array of formats, and moment will try them all.

@jetzhou
jetzhou commented Oct 6, 2015

For everyone following @cspotcode's workaround, note that the second argument should actually be moment.ISO_8601, ie

moment("invalid-date", moment.ISO_8601).isValid()==false

relating to #2036

@kalon33 kalon33 referenced this issue in landonreed/otp-gl Oct 7, 2015
Open

Syntax errors, impossible to get an itinerary #1

@auluckh23

What if my date is in this format: "2015-10-06 00:00:00.0" and in my function I am doing this:

moment("2015-10-06 00:00:00.0").format("D MMM YYYY");

Is this fine or will it stop working?

@c1phr c1phr added a commit to c1phr/bootstrap-datetimepicker that referenced this issue Oct 14, 2015
@c1phr c1phr Fix for Moment deprecation warning
[Moment deprecated](moment/moment#1407)
calling ```moment()``` without formatting information, and the
defaultDate setup was calling ```getMoment()``` without ever having
fired ```initFormatting()```. This threw an ugly deprecation warning in
the console from Moment.
5c506a4
@c1phr c1phr referenced this issue in Eonasdan/bootstrap-datetimepicker Oct 14, 2015
Open

Fix for Moment deprecation warning #1371

@nitulkukadia

@ichernev Could you please add the final conclusion, As comments in this issue is too long.

@adrianaguirre

I'm sorry guys I'm having a hard time understanding. How can I modify this code so that I am compliant?

var Benchmark = require('benchmark'),
    moment = require("./../moment.js"),
    base = moment('2013-05-25');

module.exports = {
  name: 'clone',
  onComplete: function(){console.log('done');},
  fn: function(){base.clone();},
  async: true
};
@warrendodsworth

By using the default JavaScript Date constructor to construct your date object before sending it in to moment. So moment doesn't have to be responsible for parsing your Date string.

moment(new Date('2013-05-25'));
@ipsita93

I get the same error as @imsobear. I am trying to convert from "9:00 AM" format to "00:00:00" format so I can store it as a TIME type in MySQL database. But how to do so?

moment("9:00 AM").format("HH:mm:ss");

Deprecation warning: moment construction falls back to js Date. This is discouraged and will be removed in upcoming major release. Please refer to https://github.com/moment/moment/issues/1407 for more info. Error at Function.createFromInputFallback (http://localhost:3000/javascripts/vendor/moment.js:746:36) at configFromString (http://localhost:3000/javascripts/vendor/moment.js:826:32) at configFromInput (http://localhost:3000/javascripts/vendor/moment.js:1353:13) at prepareConfig (http://localhost:3000/javascripts/vendor/moment.js:1340:13) at createFromConfig (http://localhost:3000/javascripts/vendor/moment.js:1307:44) at createLocalOrUTC (http://localhost:3000/javascripts/vendor/moment.js:1385:16) at local__createLocal (http://localhost:3000/javascripts/vendor/moment.js:1389:16) at utils_hooks__hooks (http://localhost:3000/javascripts/vendor/moment.js:16:29) at Object.$.validate.submitHandler (http://localhost:3000/javascripts/addstudentform.js:620:35) at d (http://localhost:3000/javascripts/vendor/jquery.validate.min.js:4:885) addstudentform.js:621 Invalid date
@erikjung erikjung referenced this issue in cloudfour/core-hbs-helpers Oct 27, 2015
Closed

Timestamp helper could be updated based on latest moment.js #11

@iamstarkov

I started getting deprecation warning, but cannot see how I can use both locale and strictness without using this going-to-be-deprecated feature:

moment('23 December 2015', 'DD MMMM YYYY', 'en', true).isValid();

@ichernev what is the migration path for this feature?

@asifrafeeq asifrafeeq referenced this issue in moment/momentjs.com Nov 9, 2015
Closed

Cannot register custom long date formats #121

@adamreisnz

I seem to be getting this warning after a moment object is coerced into a string. The resulting string becomes %222015-11-11T10:59:59.999Z%22, which corresponds to "2015-11-11T10:59:59.999Z". Isn't a moment supposed to convert itself to a string into a format which would be validated by the moment constructor itself?

Is moment adding those quotes or is that coming out of the toString() method like that?

@mj1856
Member
mj1856 commented Nov 11, 2015

@adambuczynski looks like url encoding. Moment won't do that, must be coming from elsewhere.

@mj1856
Member
mj1856 commented Nov 11, 2015

@iamstarkov - That code is fine and does not produce the deprecation error, nor will it be removed.

@mj1856
Member
mj1856 commented Nov 11, 2015

@ipsita93

moment("9:00 AM","h:mm a").format("HH:mm:ss");
@iamstarkov

@mj1856 actually, its producing error, while im using momentjs in get-md-date in exactly that way

@mj1856
Member
mj1856 commented Nov 11, 2015

@warrendodsworth - yuck - no, please avoid that. The Date constructor will parse differently depending on implementation. In most current browsers, moment(new Date('2013-05-25')) would produce the local equivalent of the UTC midnight of that date, similar to if you used moment.utc('2013-05-25').local().

Just do moment('2013-05-25'), which is not deprecated. Or, to be absolutely certain, use moment('2013-05-25','YYYY-MM-DD'), which will do the same thing.

@mj1856
Member
mj1856 commented Nov 11, 2015

@adrianaguirre - Your code is already compliant, at least the code you showed here. 2013-05-25 is one of the recognized ISO 8601 formats.

@mj1856
Member
mj1856 commented Nov 11, 2015

@auluckh23 - Yes, that is fine. Fractional seconds are valid by ISO8601.

@mj1856
Member
mj1856 commented Nov 11, 2015

@pmolaro, and all others trying to just remove the deprecation warning. Yes, moment(new Date(string)) will stop the deprecation warning, but then you are entirely missing the point.

The point is, parsing dates via the Date object is unreliable and inconsistent across platforms. There are different implementations and different behaviors. Sometimes you may get local time. Sometimes you may get UTC. Sometimes you may get Invalid Date. Sometimes you will get different results near DST transitions.

Don't try to defeat the error. Instead, follow our guidelines. Either use a known format or supply a format string.

The known formats are the ISO8601 forms listed here, and the older ASP.NET JSON Date form shown here. Anything else needs a format string.

@mj1856 mj1856 locked and limited conversation to collaborators Nov 11, 2015
@mj1856
Member
mj1856 commented Nov 11, 2015

I've locked this thread. If after reading this thread and looking at your code carefully you still don't understand, then chat with me on Gitter. There's nothing more to talk about here. Thanks.

@mj1856 mj1856 removed the todo label Nov 11, 2015
@santigimeno santigimeno referenced this issue in santigimeno/cron-parser Feb 29, 2016
@santigimeno santigimeno Add timezone support 5c6d28c
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