---
title: parseEpochNanos
---

`parseEpochNanos` converts a string string argument to nanoseconds since the Epoch.
Date-time strings are formatted according to the ISO 8601 date time format `yyyy-MM-ddThh:mm:ss[.SSSSSSSSS] TZ` and others. Additionally, date time strings can be integer values that are nanoseconds, milliseconds, or seconds from the Epoch. Expected date ranges are used to infer the units.

## Syntax

```
parseEpochNanos(s)
```

## Parameters

<ParamTable>
<Param name="s" type="string">

The string to be converted.

</Param>
</ParamTable>

## Returns

Nanoseconds since the Epoch.

## Examples

```groovy order=:log
parse1 = parseEpochNanos("2022-01-01T12:34:56 ET")
parse2 = parseEpochNanos("2012-01-01T12:34:56 ET")
println parse1
println parse2
```

## Related Documentation

- [Time in Deephaven](../../../conceptual/time-in-deephaven.md)
- [Javadoc](https://deephaven.io/core/javadoc/io/deephaven/time/DateTimeUtils.html#parseEpochNanos(java.lang.String))