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YY-MM-DD The Gregorian calendar date in standard 2-digit yearmonthday notation. The YMD order is the ISO order and can be sorted. |
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HH:MM:SS The time of day in 24-hour clock notation. This is the hour, minute, and second of the current UTC time. |
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dd A two-digit code, which indicates the status of daylight savings. This code has two general modes: |
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Constant mode. In this mode, the value remains constant. This mode is the most frequent one. During standard time, the value is 00. During daylight savings time, the value is 50. |
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Countdown mode. This mode is initiated twice per year. In the spring, fifty days before the change to daylight savings time, the value is set to 99 and decremented daily until it reaches 50, when daylight savings time takes effect. The value remains at '50' during the period of daylight savings time, until autumn. Fifty days before standard time resumes, the count is again decremented daily until 00 is reached and standard time is in effect. In this case, daylight savings time ends on 29 October 1995. |
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L This is a one-digit code which indicates whether a leap second is to be added or subtracted at midnight on the last day of the current month. There are three possible values: |
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0 indicates no leap second change. In this case, the last minute has 60 seconds. |
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1 indicates the addition of a second. In this case, the last minute has 61 seconds. |
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2 indicates the subtraction of one second. In this case, the last minute has 59 seconds. |
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s.u This code is called UT1 and contains a correction factor to UTC which allows for the conversion to an older representational system used for navigation. The s stands for "sign," which is + or -. |
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mmm.m This code is the number of milliseconds by which ACTS advances the time to account for line delays through the modem and telephone lines. The default value is 45ms. This value can change if receiving-end software cooperates with ACTS, discussed below, to establish an actual value. |
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UTC(NIST) This string simply identifies the ACTS string as Coordinated Universal Time (UTC, the internationally accepted acronym) supplied by NIST. |
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x NIST transmits a symbol, either * or # as an actual time mark at the moment represented by the values in the string. There are two values for the time mark because ACTS has a limited interactive capability. The initial string sent by NIST contains an asterisk |
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