# 1. monthly reporting interval, no end dates, shows just the intervals with data:
bin/hledger -f- register --period 'monthly'
<<<
2011/2/1
  (a)  1
>>>
2011/02/01 - 2011/02/28         a                                 1            1
>>>=0

# 2. or with a query pattern, just the intervals with matched data:
bin/hledger -f- register --period 'monthly' b
<<<
2011/1/1
  (a)  1

2011/2/1
  (b)  1
>>>
2011/02/01 - 2011/02/28         b                                 1            1
>>>=0

# 3. with --empty, show all intervals spanned by the journal
# (unlike current ledger, but more useful)
bin/hledger -f- register --period 'monthly' b --empty
<<<
2011/1/1
  (a)  1

2011/2/1
  (b)  1

2011/3/1
  (c)  1
>>>
2011/01/01 - 2011/01/31                                           0            0
2011/02/01 - 2011/02/28         b                                 1            1
2011/03/01 - 2011/03/31                                           0            1
>>>=0

# 4. any specified begin/end dates limit the intervals reported
bin/hledger -f- register --period 'monthly to 2011/3/1' b --empty
<<<
2011/1/1
  (a)  1

2011/2/1
  (b)  1

2011/3/1
  (c)  1
>>>
2011/01/01 - 2011/01/31                                           0            0
2011/02/01 - 2011/02/28         b                                 1            1
>>>=0

# 5. likewise for date-restricting display expressions
bin/hledger -f- register --period 'monthly to 2011/2/1' b --empty --display 'd<[2011/2/1]'
<<<
2011/1/1
  (a)  1

2011/2/1
  (b)  1

2011/3/1
  (c)  1
>>>
2011/01/01 - 2011/01/31                                           0            0
>>>=0