feat: add SolsticeEvent model with UTC-to-local conversion

1 files changed, 38 insertions, 0 deletions

diff --git a/Solverv/Models/SolsticeEvent.swift b/Solverv/Models/SolsticeEvent.swift
new file mode 100644
index 0000000..46c14ac
--- /dev/null
+++ b/Solverv/Models/SolsticeEvent.swift
@@ -0,0 +1,38 @@
+import Foundation
+
+struct SolsticeEvent: Identifiable, Codable {
+    let id: UUID
+    let name: String
+    let date: Date // UTC
+    let season: Season
+
+    init(name: String, date: Date, season: Season) {
+        self.id = UUID()
+        self.name = name
+        self.date = date
+        self.season = season
+    }
+
+    /// Convert UTC date to user's local timezone
+    func localDateTime() -> Date {
+        let utcCalendar = Calendar(identifier: .gregorian)
+        var utcComponents = utcCalendar.dateComponents([.year, .month, .day, .hour, .minute, .second], from: date)
+        let timeZone = TimeZone.current
+        let offset = timeZone.secondsFromGMT(for: date)
+
+        var localCalendar = Calendar.current
+        localCalendar.timeZone = timeZone
+        var localComponents = utcComponents
+        localComponents.second = (localComponents.second ?? 0) + offset
+
+        return localCalendar.date(from: localComponents) ?? date
+    }
+
+    /// Days until this event from today
+    func daysUntil() -> Int {
+        let today = Calendar.current.startOfDay(for: Date())
+        let eventDay = Calendar.current.startOfDay(for: date)
+        let components = Calendar.current.dateComponents([.day], from: today, to: eventDay)
+        return max(0, components.day ?? 0)
+    }
+}