Split a date range into week long arrays with appropriate padding at the beginning and end to ensure that the weeks always start on Monday.

gistfile1.rb

@from_date = Date.parse("1/10/2013")
@to_date = Date.parse("31/10/2013")

date_range = [*@from_date..@to_date]
prepend = (date_range)[0].wday # 2
append = (date_range)[-1].wday # 4
weeks = (date_range).unshift(*2..prepend).push(*2..append).each_slice(7).to_a

# [
#     [0] [
#         [0] 2,
#         [1] Tue, 01 Oct 2013,
#         [2] Wed, 02 Oct 2013,
#         [3] Thu, 03 Oct 2013,
#         [4] Fri, 04 Oct 2013,
#         [5] Sat, 05 Oct 2013,
#         [6] Sun, 06 Oct 2013
#     ],
#     [1] [
#         [0] Mon, 07 Oct 2013,
#         [1] Tue, 08 Oct 2013,
#         [2] Wed, 09 Oct 2013,
#         [3] Thu, 10 Oct 2013,
#         [4] Fri, 11 Oct 2013,
#         [5] Sat, 12 Oct 2013,
#         [6] Sun, 13 Oct 2013
#     ],
#     [2] [
#         [0] Mon, 14 Oct 2013,
#         [1] Tue, 15 Oct 2013,
#         [2] Wed, 16 Oct 2013,
#         [3] Thu, 17 Oct 2013,
#         [4] Fri, 18 Oct 2013,
#         [5] Sat, 19 Oct 2013,
#         [6] Sun, 20 Oct 2013
#     ],
#     [3] [
#         [0] Mon, 21 Oct 2013,
#         [1] Tue, 22 Oct 2013,
#         [2] Wed, 23 Oct 2013,
#         [3] Thu, 24 Oct 2013,
#         [4] Fri, 25 Oct 2013,
#         [5] Sat, 26 Oct 2013,
#         [6] Sun, 27 Oct 2013
#     ],
#     [4] [
#         [0] Mon, 28 Oct 2013,
#         [1] Tue, 29 Oct 2013,
#         [2] Wed, 30 Oct 2013,
#         [3] Thu, 31 Oct 2013,
#         [4] 2,
#         [5] 3,
#         [6] 4
#     ]
# ]