---
title: timeIntervalSince1970
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/nsdate/timeintervalsince1970
---

# timeIntervalSince1970

The interval between the date object and 00:00:00 UTC on 1 January 1970.

## Declaration

```swift
var timeIntervalSince1970: TimeInterval { get }
```

## Discussion

Discussion This property’s value is negative if the date object is earlier than 00:00:00 UTC on 1 January 1970.

## See Also

### Getting Time Intervals

- [timeIntervalSince(_:)](foundation/nsdate/timeintervalsince(_:).md)
- [timeIntervalSinceNow](foundation/nsdate/timeintervalsincenow.md)
- [timeIntervalSinceReferenceDate](foundation/nsdate/timeintervalsincereferencedate-swift.property.md)
- [timeIntervalSinceReferenceDate](foundation/nsdate/timeintervalsincereferencedate-swift.type.property.md)
- [NSTimeIntervalSince1970](foundation/nstimeintervalsince1970.md)