---
title: "CFTimeZoneGetSecondsFromGMT(_:_:)"
framework: corefoundation
role: symbol
role_heading: Function
path: "corefoundation/cftimezonegetsecondsfromgmt(_:_:)"
---

# CFTimeZoneGetSecondsFromGMT(_:_:)

Returns the difference in seconds between the receiver and Greenwich Mean Time (GMT) at the specified date.

## Declaration

```swift
func CFTimeZoneGetSecondsFromGMT(_ tz: CFTimeZone!, _ at: CFAbsoluteTime) -> CFTimeInterval
```

## Parameters

- `tz`: The time zone to analyze.
- `at`: The date at which the interval is to be computed.

## Return Value

Return Value The difference in seconds between tz and GMT at the specified date, at.

## See Also

### Getting Information About Time Zones

- [CFTimeZoneGetName(_:)](corefoundation/cftimezonegetname(_:).md)
- [CFTimeZoneCopyLocalizedName(_:_:_:)](corefoundation/cftimezonecopylocalizedname(_:_:_:).md)
- [CFTimeZoneGetData(_:)](corefoundation/cftimezonegetdata(_:).md)