==================
date1
==================
~1990.12.29
~2020.3.15
---

(source_file
    (date) (Gap)
    (date)
)

==================
date2
==================
~d2.h1.m32.s50
~h5.m1
~d2.s55
---

(source_file
    (date) (Gap)
    (date) (Gap)
    (date)
)

==================
date3
==================
~1990.12.29..0293.39af.ff59
~2020.3.15..1111
~d2.h1.m32.s50..aaaa
~h24.m1.s2..ffff.023a.eeee
~d2..129f.abcd.1234
---

(source_file
    (date) (Gap)
    (date) (Gap)
    (date) (Gap)
    (date) (Gap)
    (date)
)
