# isQuarterStart {#isquarterstart}

**Parent topic:**[Functions](../../Functions/category.md)

## Syntax {#syntax}

`isQuarterStart(X)`

## Arguments {#arguments}

**X** is a scalar/vector of type DATE, DATEHOUR, DATETIME, TIMESTAMP or NANOTIMESTAMP.

## Details {#details}

Determine if each element in *X* is the first day of a quarter.

## Examples {#examples}

```
isQuarterStart(2012.04.01);
// output: true

isQuarterStart([2012.04.01,2012.05.01]);
// output: [true,false]
```

Related function: [isQuarterEnd](isQuarterEnd.md)

