diff --git a/src/main.zig b/src/main.zig
index 5577b95..f219103 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -114,7 +114,7 @@ pub const DateTime = struct {
                 seconds -= 60;
                 minutes -= 1;
             }
-            const second = @intCast(u6, seconds + 60);
+            const second = @as(u6, @intCast(seconds + 60));
             return Self{
                 .year = year,
                 .month = month.?,
@@ -145,15 +145,15 @@ pub const DateTime = struct {
             return Self{
                 .year = year,
                 .month = month,
-                .day = @intCast(u8, day),
-                .hour = @intCast(u5, hour),
-                .minute = @intCast(u6, minute),
-                .second = @intCast(u6, seconds),
+                .day = @as(u8, @intCast(day)),
+                .hour = @as(u5, @intCast(hour)),
+                .minute = @as(u6, @intCast(minute)),
+                .second = @as(u6, @intCast(seconds)),
                 .tz = .utc,
             };
         } else {
             return Self{
-                .year = Year.new(0),
+                .year = Year.new(1970),
                 .month = .january,
                 .day = 1,
                 .hour = 0,
@@ -171,7 +171,7 @@ pub const DateTime = struct {
     pub fn weekday(self: Self) WeekDay {
         const ts = self.toTimestamp();
         const days = @divTrunc(ts, SECONDS_PER_DAY);
-        return @intToEnum(WeekDay, @rem(days, 7));
+        return @as(WeekDay, @enumFromInt(@rem(days, 7)));
     }
 
     pub fn compare(self: Self, other: Self) Comparison {
@@ -190,7 +190,7 @@ pub const DateTime = struct {
         _ = options;
 
         try writer.print("{s}-{d:0>2}-{d:0>2}", .{
-            self.year, @enumToInt(self.month), self.day,
+            self.year, @intFromEnum(self.month), self.day,
         });
         if (self.hour) |h| {
             try writer.print("T{d:0>2}", .{h});
@@ -209,7 +209,7 @@ pub const DateTime = struct {
         writer: anytype,
     ) !void {
         try writer.print("{s}{d:0>2}{d:0>2}", .{
-            self.year, @enumToInt(self.month), self.day,
+            self.year, @intFromEnum(self.month), self.day,
         });
         if (self.hour) |h| {
             try writer.print("T{d:0>2}", .{h});