Create dateFmt function

It's easier to keep the date as an epoch in PostgreSQL to do comparisons, but I always want to show it to the user as a formatted date

src/date_fmt.zig

@@ -0,0 +1,8 @@
+const std = @import("std");
+const zeit = @import("zeit");
+
+pub fn dateFmt(allocator: std.mem.Allocator, epoch: i64) ![]const u8 {
+    var date = std.ArrayList(u8).init(allocator);
+    try (try zeit.instant(.{ .source = .{ .unix_timestamp = @divFloor(epoch, 1_000) } })).time().strftime(date.writer(), "%d %b %Y, %H:%M");
+    return date.items;
+}