I have a moment value passed to a function and I try to format the moment to a string in the format YYYY-MM-DD HH:mm (SS-ISO 8601). The date is accurately formatted but the time value is omitted.

Code:

timeTransformer(value: moment.Moment) {
    return value == null ? null : value.format('YYYY-MM-DD HH:mm'); //Time is 00:00 even though I can see that moment has values 15:37:19
}

I have a moment value passed to a function and I try to format the moment to a string in the format YYYY-MM-DD HH:mm (SS-ISO 8601). The date is accurately formatted but the time value is omitted.

Code:

timeTransformer(value: moment.Moment) {
    return value == null ? null : value.format('YYYY-MM-DD HH:mm'); //Time is 00:00 even though I can see that moment has values 15:37:19
}

• javascript
• angular
• typescript
• momentjs

• Do not use Internal properties like _i and _d. – VincenzoC Commented Oct 31, 2017 at 10:23
• I don´t, what do you mean? I use value.format where value is the moment value. The reason _i and _d are visible is because I wanted to show that the moment has time properties set. The image is from the Watch window in the Chrome console. – Marcus Commented Oct 31, 2017 at 10:26
• 2 I wanted to sugggest to do not look at the value of _ internal properties. If you think that something is wrong with parsing and showing value of a moment object, please share relevant code. Where does value e from? – VincenzoC Commented Oct 31, 2017 at 10:29
• 1 Again, do not look at _i value, but please share the code you are using to create value var. – VincenzoC Commented Oct 31, 2017 at 10:38
• 1 @Marcus It'll be to do with when it's dealing with timezones etc - even when dealing with just the date part, it needs to know times as depending on the timezone, even the date might change. – James Thorpe Commented Oct 31, 2017 at 11:17

1 Answer 1

As per the documentation:

As such, the values of _d and any other properties prefixed with _ should not be used for any purpose.

Having said that, we can explain what's going on. In your case, we can see both _i and _f are set. _i would appear to be used to store the initial value you passed to moment. _f looks to store the format you told moment to parse the input with. See here:

var m = moment('2017/10/04 12:34:56', 'YYYY/MM/DD');
console.log(m._i);
console.log(m._f);
console.log(m.format('YYYY-MM-DD HH:mm'))

<script src="https://cdnjs.cloudflare./ajax/libs/moment.js/2.19.1/moment.min.js"></script>

The _i property is set in the same way, but logging .format('YYYY-MM-DD HH:mm') shows the same 00:00 you see. This is because I told moment to parse it as YYYY/MM/DD - you used YYYY-MM-DD.

To get the time working, you need to go and alter the code that is creating your moment object.