#!/usr/bin/env dub

/+ dub.sdl:

    name "hello"

+/

​

import std.stdio;

import std.datetime;

import std.regex;

import std.base64;

import std.string;

import std.algorithm;

​

private immutable string[] months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];

​

void main()

{

    string dstr = "29-Apr-2019 11:04";

    SysTime dateProgrammed;

​

    ubyte[] full = new ubyte[128];

​

    auto m = matchFirst(dstr, regex(r"([0-9]{2})-([A-Z][a-z]{2})-([0-9]{4}) ([0-9]{2}):([0-9]{2})"));

    assert(m.length > 0, "Date string is invalid");

    import std.conv: to;

    DateTime d = DateTime(1990, 1, 1);

    d.month = to!Month(months.join.indexOf(m[2])/3+1);

    d.year = m[3].to!short;

    d.day = m[1].to!ubyte;

    d.hour = m[4].to!ubyte;

    d.minute = m[5].to!ubyte;

    dateProgrammed = SysTime(d, 0.seconds);

​

    copy("test_string".representation, full[8..16]);

​

    import std.format: format;

    string date = format!("%d-%3s-%d %02d:%02d")(dateProgrammed.day,

        months[dateProgrammed.month-1], dateProgrammed.year,

    dateProgrammed.hour, dateProgrammed.minute);

    copy(date.representation, full[24..44]);

​

    Base64.encode(full).writeln;

}