ANSI Z21.18b-2005 pdf download American National Standard/CSA Standard For Gas Appliance Pressure Regulators
1.13 Marking
1.13.7
Each separable component shall bear a separate marking indicating the date of manufacture. This marking shall be specified in “-a””, “-b” or“C” below.
a.The date in the form of:
1.The month, day and year; or
2.The day, month and year.
The abbreviation of the month shalf be at least the first three letters of the month. The day may be the Monday of the week and the year must be at least the last two digits of the year.
b.A four digit date code consisting of:
1.The first and second digits indicating the calendar year in which the regulator was manufactured (e.g, 00 for 2000).
2.The third and fourth digits indicating the week in which the regulator was manufactured (e.g.03 for the third week of the year). For purposes of this marking, a week shall begin at 0001 hours on Sunday and end at 2400 hours on Saturday.
A four digit code may be used for more than one week; however, it shall not be used for more than four consecutive weeks, nor more than two weeks into the next calendar year.

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