ISO 8583 · Data fields

Field 7Transmission Date and Time

pyiso8583 starter profilesIndependent explanation

What this field describes

The profile assigns ten ASCII bytes to the transmission date and time. It is separate from the local transaction date and time fields.

The container does not declare a time zone or a full calendar format. Confirm both before ordering events from different systems.

Compare the two profiles

Container settings from the pinned pyiso8583 source.
Setting	`default`	`default_ascii`
Value encoding	ASCII	ASCII
Length limit	Exactly 10 bytes	Exactly 10 bytes
Prefix	None	None

Length limits describe encoded values. They exclude any length prefix. The profiles can be customized; these settings do not establish the required fields or accepted values for a live connection.

Read the field boundary

Field 710 bytesASCII value

Read exactly 10 value bytes. The next field begins immediately afterwards under this profile; no length prefix belongs to this field.

Find it in the bitmap

Bitmap: Primary
Position: 7
Byte: 1
Bit in byte: 7

Positions start at one. Bits are counted from the most significant bit of each bitmap byte. This calculation locates the field’s presence indicator, not its value.