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authorChristian Pointner <equinox@spreadspace.org>2015-07-24 19:58:39 (GMT)
committerChristian Pointner <equinox@spreadspace.org>2015-07-24 19:58:39 (GMT)
commit7ee36b6d571a0310224643547864b42433d311cd (patch)
tree8975dca3ae9cd5964343a499f2e93c520500d6fa /lib/RHRD
parent6e0e3a9c798ce1b21c939603484b0b08a4f0f23e (diff)
added utils.pm with get_rd_week
Diffstat (limited to 'lib/RHRD')
-rwxr-xr-xlib/RHRD/utils.pm56
1 files changed, 56 insertions, 0 deletions
diff --git a/lib/RHRD/utils.pm b/lib/RHRD/utils.pm
new file mode 100755
index 0000000..3a49ebb
--- /dev/null
+++ b/lib/RHRD/utils.pm
@@ -0,0 +1,56 @@
+# rddb.pm
+#
+# rhrdlibs
+#
+# Copyright (C) 2015 Christian Pointner <equinox@helsinki.at>
+#
+# This file is part of rhrdlibs.
+#
+# rhrdlibs is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# any later version.
+#
+# rhrdlibs is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with rhrdlibs. If not, see <http://www.gnu.org/licenses/>.
+#
+
+package RHRD::rddb;
+
+use strict;
+use DateTime;
+use DateTime::TimeZone;
+
+sub get_rd_week
+{
+ #
+ # This computes the current Rivendell Week based on the number
+ # of weeks since epoch.
+ #
+ # Explanation:
+ # epoch was at 01.01.1970 which was a Thursday.
+ # Monday in that week is (s-from-epoch + 3*24*60*60) seconds ago.
+ # This needs to be adjusted by the timezone offset for Europe/Vienna
+ # which is of course not constant (damn you daylight savings time)
+ # Divide this by (7*24*60*60) and you get the number of
+ # weeks since the Monday in the week of epoch adjusted for timezone offsets.
+ # This week had week number 3 so add an offset of 2 and
+ # get the modulo of 4. This rounded down gives you the current week
+ # with 0 meaning Week 1. So add 1 to that number and you will get
+ # the current RD week.
+ #
+ my $now = DateTime->now();
+ my $tz = DateTime::TimeZone->new(name => 'Europe/Vienna');
+ my $tz_offset = $tz->offset_for_datetime($now);
+ my $sEpoch = $now->epoch() + $tz_offset;
+ my $week = floor(((($sEpoch + 259200)/604800) + 2) % 4) + 1;
+
+ return $week;
+}
+
+return 1;