fix(members): properly check for ongoing subscription

lib/calc.js

@@ -1,4 +1,4 @@
-import {add, sub} from 'date-fns'
+import {add, isBefore, sub} from 'date-fns'
 import {chain, sumBy, minBy} from 'lodash-es'
 
 /**
@@ -13,11 +13,13 @@ export function computeSubcriptionEndDate(startDate) {
 /* Legacy model functions */
 
 export function isPresenceDuringAbo(presenceDate, abos) {
-  const oneMonthBefore = getDateOneMonthBefore(presenceDate)
+  const oneMonthBefore = new Date(getDateOneMonthBefore(presenceDate))
+  const presence = new Date(presenceDate)
 
-  return abos.some(
-    abo => oneMonthBefore < abo.aboStart && abo.aboStart <= presenceDate
-  )
+  return abos.some(abo => {
+    const started = new Date(abo.aboStart)
+    return isBefore(oneMonthBefore, started) && isBefore(started, presence)
+  })
 }
 
 export function computeBalance(user, memberActivity) {