Testing coding scheme support
Testing SMPP time format parser
'': 0 == 1970-01-01 00:00:00
'220517175524000+': 1652810124 == 2022-05-17 17:55:24
'220517175524000-': 1652810124 == 2022-05-17 17:55:24
'220517175524004+': 1652806524 == 2022-05-17 16:55:24
'220517175524004-': 1652813724 == 2022-05-17 18:55:24
'000000010000000R': 1652749200 == 2022-05-17 01:00:00
'000001000000000R': 1652832000 == 2022-05-18 00:00:00