# last_block_time_or_null · Rell standard library · Chromia Docs (concept)

> val last_ block_ time_ or_ null: integer ? The timestamp of the most recently built block in the blockchain, in milliseconds. If there are no blocks in the

Source: https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/rell.test/last_block_time_or_null/

PROPERTY

# last\_block\_time\_or\_null

```signature
val last_block_time_or_null: integer?
```

The timestamp of the most recently built block in the blockchain, in milliseconds.

If there are no blocks in the blockchain (i.e. if the first block in the blockchain has yet to be
built), this is `null`.

If a value is present, it is a [Unix epoch timestamp](https://en.wikipedia.org/wiki/Unix_time), i.e.
the number of milliseconds that have elapsed since midnight on 1st January 1970.

**See Also**

1. [`rell.test.block` - Rell Standard Library](https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/rell.test/block/)

Since 0.13.3

[View this page on docs.chromia.com](https://docs.chromia.com/pages/rell-stdlib/-rell%20-system%20-library/rell.test/last_block_time_or_null.html)Generated API reference, mirrored from the live docs