User:Enterprisey/offset-history-link.js

( function {    var diffCell = document.querySelector( "td.diff-ntitle" );    if( diffCell ) {        mw.loader.using( [ "mediawiki.api" ], function  { new mw.Api.get( {               action: "query",                prop: "revisions",                revids: mw.config.get( "wgDiffNewId" ),                rvprop: "timestamp"            } ).then( function ( data ) {                var timestamp = data.query.pages[ mw.config.get( "wgArticleId" ) ].revisions[0].timestamp;                var TIMESTAMP_RGX = /(\d{4})-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)/;                var timestampMatch = TIMESTAMP_RGX.exec( timestamp );                var year = parseInt( timestampMatch[1] ),                    month = parseInt( timestampMatch[2] ),                    day = parseInt( timestampMatch[3] ),                    hour = parseInt( timestampMatch[4] ),                    minute = parseInt( timestampMatch[5] ),                    second = parseInt( timestampMatch[6] );                var newTimestamp;                var paddedMonth = month < 10 ? '0' + month : '' + month; function pad( x ) { return ( x < 10 ) ? '0' + x : '' + x; }

// perhaps the most ludicrous if statement I've ever written. // I look forward to seeing if it works if someone ever uses // this script on an edit made during the final second of the year. if( second !== 59 ) { newTimestamp = year + pad( month ) + pad( day ) + pad( hour ) + pad( minute ) + pad( second + 1 ); } else if( minute !== 59 ) { newTimestamp = year + pad( month ) + pad( day ) + pad( hour ) + pad( minute + 1 ) + "00"; } else if( hour !== 23 ) { newTimestamp = year + pad( month ) + pad( day ) + pad( hour + 1 ) + "0000"; } else { var leapYear = ( ( year % 4 == 0 ) && ( year % 100 != 0 ) ) || ( year % 400 == 0 ); var febLen = leapYear ? 29 : 28;                   var monthLength = [ 31, febLen, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ][ month ]; if( day !== monthLength ) { newTimestamp = year + pad( month ) + pad( day + 1 ) + "000000"; } else if( month !== 12 ) { newTimestamp = year + pad( month + 1 ) + "00000000"; } else { newTimestamp = ( year + 1 ) + "0000000000"; }               }

var histUrl = mw.config.get( "wgScript" ) + "?action=history" + "&title=" + encodeURIComponent( mw.config.get( "wgPageName" ) ) + "&offset=" + newTimestamp; var contribsUrl = mw.config.get( "wgScript" ) + "?title=Special:Contributions" + "&offset=" + newTimestamp + "&target=" + encodeURIComponent( diffCell.querySelector( "a.mw-userlink" ).textContent ); $( diffCell ).prepend(                   $( "", { "href": histUrl } ).text( "History" ),                    " / ",                    $( "", { "href": contribsUrl } ).text( "contribs" ),                    " starting here"                ); } );       } );    } } );