Add moment.js for date related things (#50)

Fix saving

Use mixin everywhere

Format attachment dates

Add format date mixing

Use moment js on task list page

Use moment js on home page tasks

Add moment js

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/50

src/services/attachment.js

@@ -82,4 +82,9 @@ export default class AttachmentService extends AbstractService {
 				cancel()
 			})
 	}
+
+	processModel(model) {
+		model.created = Math.round(+new Date(model.created) / 1000)
+		return model
+	}
 }

src/services/task.js

@@ -1,5 +1,6 @@
 import AbstractService from './abstractService'
 import TaskModel from '../models/task'
+import AttachmentService from './attachment'
 
 export default class TaskService extends AbstractService {
 	constructor() {
@@ -81,6 +82,14 @@ export default class TaskService extends AbstractService {
 			})
 		})
 
+		// Process all attachments to preven parsing errors
+		if(model.attachments.length > 0) {
+			const attachmentService = new AttachmentService()
+			model.attachments.map(a => {
+				return attachmentService.processModel(a)
+			})
+		}
+
 		return model
 	}
 }