[VarDumper] Fix interval caster with PT3600S-like spec#23793

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maidmaid wants to merge 3 commits intosymfony:3.4from

maidmaid:vardumper-fix-interval

Commits on Aug 4, 2017

Fix interval caster with PT3600S-like spec
maidmaid
committed

Commits on Aug 5, 2017

Use %a format after recalculating carry over points
maidmaid
committed

Commits on Aug 6, 2017

recalculate carry over points only in 0 month/year case
maidmaid
committed