I'd like to resurrect this post. because this is a great question that many people may ask when they use collector:
after 2 years since the original post, I believe there's a great open source tool available for us:
Try ArcGIS Online Assistant
You can see the JSON data of your web map, and you can change the layer definition and save back.
In the layer definition, define your own expression and save.
"layerDefinition": {
.....
"definitionExpression": "CreationDate >=DATEADD(day,-1,convert(date,GETDATE()))"
......
}
USING THIS TOOL WITH CARE AND AT YOUR OWN RISK, AS IT COULD CORRUPT YOUR CONTENT. so I strongly suggest make a copy before you change anything using ago-assistant.