1 files changed, 34 insertions, 0 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/TimestampHelper.swift b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/TimestampHelper.swift
new file mode 100644
index 0000000000..3cd472fa0e
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/swift/templates/TimestampHelper.swift
@@ -0,0 +1,34 @@
+fileprivate struct FfiConverterTimestamp: FfiConverterRustBuffer {
+    typealias SwiftType = Date
+
+    public static func read(from buf: inout (data: Data, offset: Data.Index)) throws -> Date {
+        let seconds: Int64 = try readInt(&buf)
+        let nanoseconds: UInt32 = try readInt(&buf)
+        if seconds >= 0 {
+            let delta = Double(seconds) + (Double(nanoseconds) / 1.0e9)
+            return Date.init(timeIntervalSince1970: delta)
+        } else {
+            let delta = Double(seconds) - (Double(nanoseconds) / 1.0e9)
+            return Date.init(timeIntervalSince1970: delta)
+        }
+    }
+
+    public static func write(_ value: Date, into buf: inout [UInt8]) {
+        var delta = value.timeIntervalSince1970
+        var sign: Int64 = 1
+        if delta < 0 {
+            // The nanoseconds portion of the epoch offset must always be
+            // positive, to simplify the calculation we will use the absolute
+            // value of the offset.
+            sign = -1
+            delta = -delta
+        }
+        if delta.rounded(.down) > Double(Int64.max) {
+            fatalError("Timestamp overflow, exceeds max bounds supported by Uniffi")
+        }
+        let seconds = Int64(delta)
+        let nanoseconds = UInt32((delta - Double(seconds)) * 1.0e9)
+        writeInt(&buf, sign * seconds)
+        writeInt(&buf, nanoseconds)
+    }
+}