<?php
$fillStart = new DateTime("2020-09-27 12:34:56");
$fillEnd = new DateTime("2020-10-10 12:34:56");
$gapStart = new DateTime("2020-09-09 01:02:03");
$gapEnd = new DateTime("2020-09-11 04:05:06");
//
// being with the original start
$fillStartModified = clone $fillStart;
// move to the next weekday and time
$wdtStart = $gapStart->format("l H:i:s");
if ($fillStartModified->format("l H:i:s") != $wdtStart) {
$fillStartModified->modify("next {$wdtStart}");
}
// get the duration, minus a bit so we can do a "next <day>" after
$days = $gapStart->diff($gapEnd)->days - 1;
// get the weekday and time
$wdtEnd = $gapEnd->format("l H:i:s");
// update
$fillEndModified = clone $fillStartModified;
$fillEndModified->modify("+${days} days");
$fillEndModified->modify("next {$wdtEnd}");
$f = "l Y-m-d H:i:s";
printf("Fill %30s -> %30s\n", $fillStart->format($f), $fillEnd->format($f));
printf("Gap %30s -> %30s\n", $gapStart->format($f), $gapEnd->format($f));
printf("New %30s -> %30s\n", $fillStartModified->format($f), $fillEndModified->format($f));
Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/UJJfa on line 27
Fill Sunday 2020-09-27 12:34:56 -> Saturday 2020-10-10 12:34:56
Gap Wednesday 2020-09-09 01:02:03 -> Friday 2020-09-11 04:05:06
New Wednesday 2020-09-30 01:02:03 -> Friday 2020-10-02 04:05:06
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/UJJfa on line 27
Fill Sunday 2020-09-27 12:34:56 -> Saturday 2020-10-10 12:34:56
Gap Wednesday 2020-09-09 01:02:03 -> Friday 2020-09-11 04:05:06
New Wednesday 2020-09-30 01:02:03 -> Friday 2020-10-02 04:05:06