Fix some date/time functions and add new helper functions

added part::backend part::frontend prio::1 type::bug type::feature labels

mentioned in merge request !62 (closed)

added 2 commits

• 3451afd9 - Fix usage of SchoolTerm.current method
• 14ecf7fb - Merge remote-tracking branch 'origin/date-time-helpers' into date-time-helpers

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added 5 commits

• 14ecf7fb...8fb3d368 - 4 commits from branch master
• 5b6aed8f - Merge branch 'master' into date-time-helpers

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mentioned in commit b081e4d3

merged