====== Service Centre Time Stamp (TP-SCTS) ======

The TP-Service-Centre-Time-Stamp field is given in semi-octet representation (each semi-octet consists of two digital decimals), and represents the local time in the following way:

^Field^Length^Description^
|Year|1|These semi-octets are in "[[#swapped-nibble-presentation|Swapped Nibble]]" mode|
|Month|1| |
|Day|1| |
|Hour|1| |
|Minute|1| |
|Second|1| |
|Timezone|1|Relation to GMT. One unit is 15min. If MSB=1, value is negative.|
E.g.: 0x99 0x20 0x21 0x50 0x75 0x03 0x21 means 12. Feb 1999 05:57:30 GMT+3

===== Swapped Nibble presentation =====
BCD code where nibbles within octet is swapped. E.g.: 0x31 Represents value of 13