Ok, I have tried it the other way round (getting the raw JSON from the configurator and putting it into the TV) and it is working now, but the date is still showing wrong. Here are my form tabs:
[{"MIGX_id":5,"caption":"Release","print_before_tabs":"1","fields":[{"field":"ReleaseTitle","caption":"Release Title","inputTVtype":"text","pos":1,"MIGX_id":5},{"field":"ReleaseType","caption":"Release Type","inputTVtype":"listbox","inputOptionValues":"LP==LP || EP==EP || Split==SPLIT || Single==SINGLE","pos":2,"MIGX_id":6},{"field":"ReleaseArt","caption":"Release Artwork","inputTVtype":"image","pos":3,"MIGX_id":7},{"field":"ReleaseDate","caption":"Release Date","inputTV":"OnlyDate","pos":4,"MIGX_id":8},{"field":"DigitalPurchaseLink","caption":"Digital Purchase Link","inputTVtype":"text","pos":5,"MIGX_id":9},{"field":"PhysicalPurchaseLink","caption":"Physical Purchase Link","inputTVtype":"text","pos":6,"MIGX_id":10}],"pos":1}]
and here is my Grid Columns:
[{"header":"Release Title","width":"70","sortable":"true","dataIndex":"ReleaseTitle","MIGX_id":1},{"header":"Release Cover","width":"50","sortable":"false","dataIndex":"ReleaseArt","renderer":"this.renderImage","MIGX_id":2},{"MIGX_id":"3","header":"Release Date","dataIndex":"ReleaseDate","width":"70","sortable":"true","show_in_grid":"1","customrenderer":"","renderer":"this.renderChunk","clickaction":"","selectorconfig":"","renderchunktpl":"[[+date:strtotime:date=`%d.%m.%Y`]]","renderoptions":"","editor":""}]
The OnlyDate TV is a modx date tv with the 'hide time from users' option selected, and the output set as default.
Any help would be greatly appreciated.
Andy