Real Time Clock
ID 187
General Attributes:
Is Stackable Yes (40)
Is Flammable No
Is Fluid Blocker No
Tool-related Attributes:
Digging Method Hack mini
Digging Resilience 1

The real time clock can be used as an in-game clock. It does not read in Earthly minutes and seconds, but in "SurvivalCraft world" time. You can create a simple clock by using this block and 7-segment displays. It is possible to convert this time into Earthly play time but is very complicated.

Description   (From Recipaedia )

A real time clock that provides an accurate and always up to date readout of time. The clock value changes even if it's far away from the player. Zero value of the clock is at the point when the game started. You canot reset the clock, it always tells the time since the game started. The clock outputs time via 5 outputs, each of them 4-bit analog signal. Sixteen least significant bits are on the four sides, and the 5th output (containing the most significant 4 bits) is on the back (you must place the clock on a wire-through-block to access the 5th output). The clock is set up so that it advances by exactly 4096 ticks each day. That means each tick is about 0.3 seconds long and that 4th output contains nember of days since the game started. Combined value of outputs 1, 2 and 3 contain time of day, to about 0.3 second accuracy. 4th output alone will overflow after 16 days. Use 5th output to extend the overflow to 256 days.


Crafting requires 3 copper ingots, 3 germanium crystals and 1 glass. You get 4 Real Time Clock chips.

Real Time Clock

Understanding Time in the Survivalcraft universe

Remember that this clock displays IN-GAME time and date. In the description it says the 'tick' is 0.3 seconds and that means real time - NOT game time. The SurvivalCraft day is divided into 4096 ticks of this clock and is about 20 minutes real time. The fourth digit of the RTC marks the SC days and it changes at midnight.

This means that midnight is at 000, noon is 800 (in Hexadecimal*), sunrise is at 400 and sunset at C00 ticks. We can look at the 3rd digit (from the right) as the 'hour' which gives the SC world a 16 hour day (instead of 24) and these hours are about one-and-a-quarter real time minutes. The 2nd digit can be the 'minutes' and they are about 5 seconds real time. There are 16 minutes to the 'hour'. The 1st digit moves so fast we usually don't need to include it but it could be the SC 'second' and of course, there are 16 seconds to the 'minute'.

We can think of the time of day by using just the hour and minute, in a way similar to 'military time' or the 24 hour clock. The daytime runs from 4:0 - 5:0 - 6:0 - 7:0 - 8:0 - 9:0 - A:0 - B:0 thru B:F, then at C:0 nighttime begins. The night hours run from C:0 - D:0 - E:0 - F:0 - 0:0 - 1:0 - 2:0 - 3:0 thru 3:F, then at 4:0 daytime begins.

NOTE: Please bear in mind that when we talk about "significant digits" we count them from right to left, from least significant to the most significant. That's why the least significant digit output has one pip on the chip. When we talk about the actual display we typically count them from left to right, as in a normal digital clock.

  • Hexadecimal is the standard way to show the 16 levels that are used in the SC electric 'analog signal' This is a universal convention in the digital arena. Since we don't have special characters for the numbers beyond 9, the English letters A-F are used. So in Hex, we count: 1 2 3 4 5 6 7 8 9 A B C D E F, then 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20, etc.

(One could call out the extra digits as: Alf, Burt, Cat, Dan, Ed, Frank. So sunset would be at "Cat o'clock".)

Days, Weeks, Months and the Moon

The higher digits, 4 and 5 count out the Survival Craft days. If we consider 16 days to the SC 'month' then 16 months to the 'year', that gives an SC year as 256 days (and the day as 256 minutes).

We know that the moon takes 4 days to go through half of its cycle (from new to full and vice versa) and we may call this the SC 'week'. This gives us 4 'weeks' to the SC month. It isn't quite the same as in the real world but is the best compromise, IMHO. The moon always starts the first day of each month in its new phase and with a bit more electric work we can even use the RTC to give us a warning for which nights we can expect to see werewolves.

Hooking it up  

The RTC has 5 ouputs on it. Each one is an analog signal which means it can have 16 values (0-F). Any output can be connected to any electric that can accept an analog signal but we would normally just use a digit display. The least significant digits are the ones that change the fastest. The least 4 are output on the edges of the chip and the 5th out the back.

The outputs are identified by the number of pips on each edge. The edge with one pip is the least significant digit - the fastest one and the rest follow suit. Once you place the RTC on a surface you can click on it and it will rotate each click so you can adjust it to the wiring. If you want to use the 5th output you must place the RTC on a wire-through block.


Basic Example

You can make a simple digital wall-type time-of-day clock by using only the 2nd and 3rd digits. This can be as small as 5 blocks (plus the space for the digits).


Smallest clock face


Smallest clock back

This is a great clock for miners and can be built with the resources found underground plus sand. (You do need a crafting table, too.)

(The time shown means it is nearing midnight.)

To make this clock with a white display, all you need is 6 Glass (blocks), 3 Germanium Crystals, 7 Copper Ingots and 7 Cobblestone. First craft 1 Copper Ingot into (2) wires and the rest is used for the other components. Then make (2) displays, (1) wire-through stone block and (1) RTC. Then put it all together as shown! There's only seven simple components and you're done. Yes, the picture is with planks but stone works just the same.

More Examples

Time plus Date

This example shows the time as above plus adds the day of the month as well. It can be useful for knowing when werewolves are about as well as the time of day. It only requires one more digit and you should make that digit a different color so it's easy to remember that it shows the date.

Date time f

Date and Time front

Date time r

Date and Time rear

This shows that it is the 3rd day of this month and is almost 2 hours past sunrise.


A calendar date display is even simpler than the Basic Time Display. Just use 2 wire-through-blocks, only 1 wire and align the RTC as shown. This shows the number of days since the start of the game. The first digit is the month number and the second is the date of that month. It starts over at every 'year'.

Date f

Month, Date front

Date r

Month, Date rear

The number shows that it is now the 3rd month and the 3rd day of that month. It is NOT the 33rd day of the year since there are 16 days in each month. It is (3*16 + 3) = the 51st day of the year.

Full clock/calendar

This example uses the full functions of the RTC. It displays all 5 digits to show the full time and calendar date. This is still not very complicated as you can see by the pictures.

Full r

Full rear

Full f

Full front

This display shows that it is the 3rd month, the 4th day of that month and just past noon (8:0).

Year number display

It would be very difficult to add a yearly display to any clock above and is much easier if done as a separate circuit. Only the 5th output is used since it will overflow on 'new years' day. This circuit must be built before the first year is over or it will miss counting the first year. It must always be left undisturbed or it will not be accurate.

Actually this circuit may not work at all. It was not tested. The problem is that some electrics will not operate if the character too far away. The counter may not advance (or even keep its value) if the character is too far away - even for an instant.

Start with the RTC and wire the 5th digit to an analog to digital converter (ADC). This separates each of the 4 bits from the 'analog' signal. The most significant bit from the ADC will change to '0' on New Year's Day. This bit is inverted and fed into a 4-bit counter. This counts the number of years since the circuit was set up. The output of the counter can be fed to a digit display as shown.

This circuit will count up to 16 years (0 - F). If you really want to count more than that, the counter can be 'chained'. Look elsewhere for how to do that.

Year f

Years front

Year r

Years rear

The way that electrics work, the counter may  start at year 1 unless it's reset after  it's built. If so, just remember that it shows which year you are in rather than the years that have passed. Or figure out a way to reset it. (The reset is applied to the back of the counter so is impossible in this design).


  • The Real Time Clock was added in the 1.23 update.

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