add iso8601 string to timestamp

src/date.zig

@@ -57,6 +57,10 @@ pub fn timestampToDateTime(timestamp: i64) DateTime {
     return DateTime{ .day = day, .month = month, .year = year, .hour = hours, .minute = minutes, .second = seconds };
 }
 
+pub fn parseIso8601ToTimestamp(data: []const u8) !i64 {
+    return try dateTimeToTimestamp(try parseIso8601ToDateTime(data));
+}
+
 const IsoParsingState = enum { Start, Year, Month, Day, Hour, Minute, Second, Millisecond, End };
 /// Converts a string to a timestamp value. May not handle dates before the
 /// epoch