fix(cron): selecting the first sunday of the month

@xen-orchestra/cron/src/next.spec.js

@@ -41,4 +41,8 @@ describe('next()', () => {
       'no solutions found for this schedule'
     )
   })
+
+  it('select the first sunday of the month', () => {
+    expect(N('* * * * 0', '2018-03-31T00:00')).toBe('2018-04-01T00:00')
+  })
 })

@xen-orchestra/cron/src/parse.js

@@ -176,10 +176,10 @@ export default createParser({
       range: [0, 11],
     },
     {
-      aliases: 'mon tue wen thu fri sat sun'.split(' '),
+      aliases: 'sun mon tue wen thu fri sat'.split(' '),
       name: 'dayOfWeek',
-      post: value => (value === 0 ? 7 : value),
-      range: [1, 7],
+      post: value => (value === 7 ? 0 : value),
+      range: [0, 6],
     },
   ],
   presets: {

@xen-orchestra/cron/src/parse.spec.js

@@ -23,7 +23,7 @@ describe('parse()', () => {
 
   it('correctly parse days', () => {
     expect(parse('* * * * mon,sun')).toEqual({
-      dayOfWeek: [1, 7],
+      dayOfWeek: [0, 1],
     })
   })
 
@@ -40,10 +40,10 @@ describe('parse()', () => {
 
   it('dayOfWeek: 0 and 7 bind to sunday', () => {
     expect(parse('* * * * 0')).toEqual({
-      dayOfWeek: [7],
+      dayOfWeek: [0],
     })
     expect(parse('* * * * 7')).toEqual({
-      dayOfWeek: [7],
+      dayOfWeek: [0],
     })
   })
 })