# Vega-lite - transform calculate methods like toDate(...)

**URL:** <https://discuss.elastic.co/t/vega-lite-transform-calculate-methods-like-todate/150875>\
**Category:** Kibana\
**Created:** [October 3, 2018, 11:28am UTC](https://discuss.elastic.co/t/vega-lite-transform-calculate-methods-like-todate/150875 "2018-10-03T11:28:05Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![tonyskulk](https://avatars.discourse-cdn.com/v4/letter/t/3be4f8/32.png) [@tonyskulk](https://discuss.elastic.co/u/tonyskulk)\
**Post date:** [October 3, 2018, 11:28am UTC](https://discuss.elastic.co/t/vega-lite-transform-calculate-methods-like-todate/150875/1 "2018-10-03T11:28:05Z")

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I have to following transformation in my vega-lite spec:

```
transform: [
	{
	  calculate: "toDate(datum._source['timestamp'])"
	  as: "time"
	}
]

```

I would need something like

```
toDateTime(...)

```

Which other calculate methods are available here?

---

<div class="post-metadata">

**Author:** ![Marius\_Dragomir](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/marius_dragomir/32/42087_2.png) [@Marius\_Dragomir](https://discuss.elastic.co/u/Marius_Dragomir)\
**Post date:** [October 4, 2018, 11:20am UTC](https://discuss.elastic.co/t/vega-lite-transform-calculate-methods-like-todate/150875/2 "2018-10-04T11:20:23Z")

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This is the list of methods available in vega-lite:

> **[Expressions](https://vega.github.io/vega/docs/expressions/)**
>
> Vega - A Visualization Grammar. Vega is a visualization grammar, a declarative format for creating, saving, and sharing interactive visualization designs. With Vega, you can describe the visual appearance and interactive behavior of a visualization...

  
I haven't searched it extensively, but you can look and see if you can find something that fits your need.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 1, 2018, 11:32am UTC](https://discuss.elastic.co/t/vega-lite-transform-calculate-methods-like-todate/150875/3 "2018-11-01T11:32:53Z")

</div>

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