Additional arithmetics, formatting and parsing functions for std.Datetime.

Use Case

1. There is a need to perform simple plus/minus arithmetics between std.DateTime and Duration:
   let now = datetime.systemNow();
   let expiration = now + duration.fromHours(1);
   let validFor = expiration - now;
   assert(now <= expiration);
   assert(expiration > now);
   ...
2. There is a need for additional formatting and parsing functions:
   let now = datetime.utcNow();
   log(now.toUtcString());
   let sd = "2024/06/18 16:15";
   let d = datetime.parse(sd, datetime.YYYYMM_HHMM);
   assert(d.format(datetime.YYYYMM_HHMM), sd);

Proposed Solution

You may find a sample implementation here: https://github.com/asterkin/endor.w/tree/main/datetimex

Implementation Notes

Some conversions from JavaScript Date to Wing DateTime are performed via ISO string which is inefficient.

Component

SDK

Community Notes

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Start with the std.Datetime SDK implementation and compare its API with the linked datetimex sample. Trace the JavaScript Date to Wing DateTime conversions, especially the ISO-string path, before defining the arithmetic, formatting, and parsing behavior. Done means the proposed DateTime and Duration operations and formatting/parsing functions work as described.