I don't know whether it's every object in your feed, but some appear to be an hour out (i.e. they're providing BST as if it were UTC). The below example shows this:
{
"state": "updated",
"kind": "session",
"id": 15616829,
"modified": "2017-09-25T09:06:09",
"data": {
"type": "Event",
"url": "https://better.org.uk/leisure-centre/banes/bath-sports-and-leisure-centre/timetable",
"name": "Functional",
"genderRestriction": "mixed",
"location": {
"type": "SportsActivityLocation",
"name": "Functional Zone",
"containedInPlace": {
"type": "Place",
"url": "https://better.org.uk/leisure-centre/banes/bath-sports-and-leisure-centre",
"name": "Bath Sports and Leisure Centre",
"address": {
"type": "PostalAddress",
"addressLocality": "Banes",
"addressRegion": "South West",
"postalCode": "BA2 4ET",
"streetAddress": "Bath Sports and Leisure Centre"
},
"geo": {
"latitude": 51.3816,
"longitude": -2.35432
},
"telephone": "01225 486905"
}
},
"organizer": {
"@type": "Organization",
"name": "Better"
},
"activity": {
"type": "Concept",
"notation": 16,
"prefLabel": "Fitness Classes",
"inScheme": "https://better.org.uk/odi/activities"
},
"level": "All",
"ageRange": "16-55",
"contributor": {
"type": "Person",
"name": "Fitness Instructor"
},
"description": "<p>Get better strength and balance. The exercises in this session are designed to help you train and prepare your body for daily tasks by simulating common movements and muscles you use everyday at home, work or during sports.</p>\r\n<p>Better for: Overall strength, coordination and balance.</p>\r\n<p><iframe src=\"//www.youtube.com/embed/wA9woUsf75A\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"></iframe></p>",
"image": "https://assets.better.org.uk/uploads/asset/attachment/27358/Homepage_Panels-Fitness_Classes_-_02-06-2015___2_.jpg",
"offer": {
"url": "https://better.legendonlineservices.co.uk/enterprise/account/Login",
"type": "Offer"
},
"startDate": "2017-10-20T07:30:00Z",
"endDate": "2017-10-20T07:55:00Z",
"duration": "PT25M",
"@context": "https://www.openactive.io/ns/oa.jsonld"
}
}
I don't know whether it's every object in your feed, but some appear to be an hour out (i.e. they're providing BST as if it were UTC). The below example shows this: