Tag expressions

Use tag expressions to create unique and dynamic watch faces. Tag expressions are conditions that allow you to change the rotation, placement, and opacity of a component based on tag values (watch data) such as date and time, battery status, or steps. Your watch face changes dynamically as the tag value changes.

For example, you can create a watch face where the object on the screen moves vertically with every passing second, or you can create a watch face with objects that appear or disappear at certain times.

Enter tag expressions directly into the rotate, placement, and opacity properties input fields of a component.

Tags must be enclosed in square brackets. To open the tag scripting popup, click Tags. In the scripting popup, you can enter lengthy tag expressions and can easily search for the data you want.

Tag descriptions and value ranges are shown in the following tables.

Date & time

Tag	Definition	Range	Example
UTC_TS	Timestamp as UTC milliseconds from the epoch		1256953732
MSEC	Millisecond	0 - 999	123
SEC	Second in minute	0 - 59	12
SEC_Z	Second in minute (leading zero)	00 - 59	03
SEC_MSEC	Second in minute, including millisecond	0.0 - 59.999	1.234
SEC_IN_DAY	Second in day	0 - 86,400	12,345
MIN	Minute in hour	0 - 59	3
MIN_Z	Minute in hour (leading zero)	00 - 59	03
MIN_SEC	Minute in hour with second	0.0 - 59.999	1.234
HOUR_0_11	Hour (0-11) in day	0 - 11	3
HOUR_0_11_Z	Hour (0-11) in day (leading zero)	00 - 11	03
HOUR_0_11_MIN	Hour (0-11) in day with minute	0.0 - 11.999	1.234
HOUR_1_12	Hour (1-12) in day	1 - 12	3
HOUR_1_12_Z	Hour (1-12) in day (leading zero)	01 - 12	03
HOUR_1_12_MIN	Hour (1-12) in day with minute	1.0 - 12.999	1.234
HOUR_0_23	Hour (0-23) in day	0 - 23	3
HOUR_0_23_Z	Hour (0-23) in day (leading zero)	00 - 23	03
HOUR_0_23_MIN	Hour (0-23) in day with minute	0.0 - 23.999	1.234
HOUR_1_24	Hour (1-24) in day	1 - 24	3
HOUR_1_24_Z	Hour (1-24) in day (leading zero)	01 - 24	03
HOUR_1_24_MIN	Hour (1-24) in day with minute	1.0 - 24.999	1.234
DAY_1_31	Day (1-31) in month	1 - 31	3
DAY_1_31_Z	Day (1-31) in month (leading zero)	01 - 31	13
DAY_1_31_HOUR	Day (1-31) in month with hour	1.0 - 31.999	1.234
DAY_WEEK	Day of week	1(Sunday) - 7(Saturday)	3
DAY_WEEK_F	Day of week (full text)	Sunday - Saturday	Wednesday
DAY_WEEK_S	Day of week (abbreviated text)	Sun - Sat	Wed
DAY_IN_YEAR	Day in year	1 - 365	123
DAYS_IN_MON	Days in the current month	28 - 31	31
MON	Month in year	1 - 12	3
MON_Z	Month in year (leading zero)	01 - 12	03
MON_F	Month in year (full text)	January - December	November
MON_S	Month in year (abbreviated text)	Jan - Dec	Nov
MON_DAY	Month with day	1.0 - 12.999	11.111
YEAR	Year	0000 - 9999	2021
YEAR_S	Abbreviated year, represented by last two digits	00 - 99	21
YEAR_MON	Year with month		2021.307
WEEK_IN_YEAR	Week in year	1-52	24
WEEK_IN_MON	Week in month	1-5	2
IS_24H	Whether the system uses 24-hour format	0 (12-Hour), 1(24-Hour)	0
IS_DST	Whether the system uses Daylight Saving Time.	0 (NO), 1(YES)	0
TMZN_ABB	Timezone abbreviation		PST
TMZN_OFS	Timezone offset	-12 - +14	+9
TMZN_OFS_WITH_DST	Timezone offset, modified for daylight saving time	-12 - +14	-7
TMZN_ID	ID of timezone(ex. Asia/Seoul)		Asia/Seoul
IS_AFTNOON	Whether the hour is before or after noon	0(AM), 1(PM)	0
AMPM_PO	Position of AM/PM string	-1(Unknown), 0(First), 1(Last)	0
AMPM	AM/PM String formatted with system locale	AM / PM	AM

Setting information

Tag	Definition	Range	Example
LANG_LOC	String representation of the system locale object, consisting of language, country, variant, script, and extensions(ex. en_US)		ko_KR

Device information

Tag	Definition	Range	Example
BATT_PER	Current battery percentage	0 - 100	70
BATT_IS_CHARGE	Whether the battery is charging	0 (NO), 1(YES)	1
BATT_IS_LOW	Whether the battery of the watch is low and not charging	0 (NO), 1(YES)	0
BATT_TEM_C	Current battery Temperature (°C)		28.8
BATT_TEM_F	Current battery Temperature (°F)		83.84

Sensor data

Tag	Definition	Range	Example
IS_ACC	Whether the device has an accelerometer sensor	0 (NO), 1(YES)	1
ACC_X	Acceleration on the x-axis
ACC_Y	Acceleration on the y-axis
ACC_Z	Acceleration on the z-axis
ACC_A_X	Acceleration angle on the x-axis	-90.0 - 90.0
ACC_A_Y	Acceleration angle on the y-axis	-90.0 - 90.0
ACC_A_Z	Acceleration angle on the z-axis	-90.0 - 90.0
ACC_A_XY	Angle X + Angle Y	-180.0 - 180.0

Health data

Note: Health data is not shown when the device is locked.

Tag	Definition	Range	Example
HR	Heart Rate	0 -	60
HR_Z	Heart Rate (leading zero)		00 80 120
HR_LAST_MEASURED_TIME	Timestamp when the heart rate is measured		1256953732
HR_MEASURE_RESULT	Whether heart rate measurement is successful or not	0 (Fail), 1 (Success)	0
HR_IS_MEASURING	Whether heart rate is measuring or not	0 (NO), 1(YES)	0
SC	Step Count	0 -	1000
SC_GOAL	Set Goal of Step Count	1 - 20000	20000
SC_PER	Current percentage to Goal of Step count	0 - 100

Moon phase

Tag	Definition	Range	Example
MOON_PO	Position of moon phase	0 - 28
MOON_TY	Type of moon phase	0 - 7	2
MOON_TY_NAME	Name of type

Range definitions for MOON_PO tag

• 0-0.5: New moon
• 0.5-6.5 : Evening crescent
• 7 : First quarter
• 7.5-13.5 : Waxing gibbous
• 14 : Full moon
• 14.5-20.5 : Waning gibbous
• 21 : Last quarter
• 21.5-27.5 : Morning crescent
• 27.5-28 : New moon

Range definitions for MOON_TY tag

• 0 : New moon
• 1 : Evening crescent
• 2 : First quarter
• 3 : Waxing gibbous
• 4 : Full moon
• 5 : Waning gibbous
• 6 : Last quarter
• 7 : Morning crescent

Functions

Functions	Definition	Expression example	Output example
round(num)	Returns the closest integer to num.	round(1.6)	2
floor(num)	Returns the greatest integer less than or equal to num.	floor(1.6)	1
ceil(num)	Returns the smallest integer that is greater than or equal to num.	ceil(1.2)	2
sin(num)	Returns the sine of num.	sin(1)	0.84147096
cos(num)	Returns the cosine of num.	cos(1)	0.5403023
tan(num)	Returns the tangent of num.	tan(1)	1.5574077
abs(num)	Returns the distance from zero.	abs(-10)	10
clamp(num, min, max)	Returns the value of clamping num between max and min.	clamp([ACC_A_X], -30, 60)	-30~60
numberFormat(form, num)	Transforms num into the format of form. form is made up of the following values. 0: Fill empty spaces with zero. #: Do not display places with no values. .: Indicates the position of the decimal point.	(numberFormat("#.#", [SEC_MSEC])) (numberFormat("#.###", ([SEC_MSEC]*10))) (numberFormat("000.000", ([SEC_MSEC]*10))) (numberFormat("0000.000", ([SEC_MSEC]*10)))	32.4 324.37 324.370 0324.370

Operators

Tag expressions support various operators. These operators can modify the value of the tag expressions.

Arithmetic operators

Arithmetic operators are basic math functions. They perform a function between two values (operands).

Operator	Definition
+	Addition
-	Subtraction
*	Multiplication
/	Quotient of division
%	Remainder of division

Examples

The following examples show how to use tags and arithmetic operations in a tag expression:

• 5 * [BATT_PER] :

  This returns the battery percentage multiplied by 5.

  If the battery percentage is 7%, then the value returned is 35.

• [SEC] / 3 :

  This returns the quotient of seconds in a minute divided by 3.

  If the number of seconds that have passed in the minute is 7, then the value returned is 2.33.

• [SEC] % 3 :

  This returns the remainder of seconds in a minute divided by 3.

  If the number of seconds that have passed in the minute is 7, then the value returned is 1.

• 3 + 5 * [BATT_PER] :

  The battery percentage is multiplied by 5, then 3 is added.

  If the battery percentage is 7%, then the value returned is 38.

  Multiplication is performed first (because it takes precedence over addition) and then 3 is added to that result: 3 + 5 * 7 → 3 + 35 → 38.

• (3 + 5) * [BATT_PER] :

  The addition operation in parentheses is performed first, then the result is multiplied by the battery percentage. If the battery percentage is 7%, then the value returned is 56.

Relational operators

Relational operators compare two values to determine which is greater than, less than, or equal to each other. A comparison that is true returns a value of one. A comparison that is false returns a value of zero.

Operator	Definition
<	Less than
<=	Less than or equal to
>	Greater than
>=	Greater than or equal to
==	Equal to
!=	Not equal to

Examples

Relational operations are sometimes combined with arithmetic operations. The following are examples that use only relational operations, or relational operations and arithmetic operations.

• [BATT_PER] <= 15 :

  If the battery percentage is less than or equal to 15%, [BATT_PER] <= 15 is true and returns 1.

  If the battery percentage is greater than 15%, [BATT_PER] <= 15 is false and returns 0.

• 1000 * ([HRATE] < 100) + 120

  If the heart rate is less than 100 bpm, [HRATE] < 100 is true and returns the value of 1. Next, multiply 1 by 1,000 and then add 120. The final value returned is 1,120.

  If the heart rate is greater than or equal to 100 bpm, [HRATE] < 100 is false and returns the value of 0 (zero).Next, multiply 0 by 1,000 and then add 120. The final value returned is 120.

Logical operators

Logical operators combine the results of two or more relational operations and return a value of 1 (true) or 0 (false). Tag expressions support two types of logical operations: AND and OR.

• AND – Represented by an asterisk (*).

  Both relational operations must be true in order for the AND logical operator to return a value of 1 (true). Otherwise, the return value is 0 (false).

  Note: The asterisk represents the multiplication arithmetic operator and the AND logical operator.

• OR – Represented by the plus sign (+).

  One or more of the relational operations must be true in order for the OR logical operator to return a value of 1 (true). If both of the relational operations are false, then the return value is 0 (false).

  Note: The plus sign represents the addition arithmetic operator and the OR logical operator.

The following table describes the results of a logical operation:

Result of relational operation 1	Result of relational operation 2	Result of AND (*) (relational operation 1) * (relational operation 2)	Result of OR (+) (relational operation 1) + (relational operation 2)
0 (false)	0 (false)	0 * 0 = 0	0 + 0 = 0
0 (false)	1 (true)	0 * 1 = 0	0 + 1 = 1
1 (true)	0 (false)	1 * 0 = 0	1 + 0 = 1
1 (true)	1 (true)	1 * 1 = 1	1 + 1 = 1

A logical operator is applied only if both of the two operands (the values on either side of the operator) are relational operations. An arithmetic operator is applied if either of the two operands is a number value.

Logical operation	Arithmetic operation	Arithmetic operation
Both operands are relational operations: (0 <= 1) * (1 < 2) Result: 1	One operand is a relational operation and the other is a value: (0 <= 1) *120 Result: 120	Both operands are values: 1*120 Result: 120
This tag expression is made up of two relational operations on either side of the operator (0<=1 and 1<2). Because of this, the logical operator is applied. Because both of the relational operations are true, the final result of this tag expression is 1 (true).	This tag expression is made up of a relational operation (0<=1) and a number value (120). Because of this, the arithmetic operator is applied. The result of the relational operation is 1 (true) which is then multiplied by 120. The final result of this operation is 120.	This tag expression is made up of two number values (1 and 120). Because of this, the arithmetic operator is applied. The result is 1 multiplied by 120 which returns a final result of 120.

Ternary operators

Ternary operations have three operands: a conditional operation, then a result if the conditional operation is true, and a result if the conditional operation is false. A conditional operation can be a relational or logical operation.

Ternary operations are presented in the following format:

conditional_operation? result_if_true: result_if_false

Examples

The following examples are used to set the opacity of an image on the watch face.

• [BATT_PER] <= 20? 15: 100

  This operation sets the opacity of an image on the watch face to 15, if battery percentage is less than or equal to 20%. Otherwise, set the opacity to 100.

• ([BATT_PER] >= 50) * ([BATT_PER] <= 75)? 100: 0

  This example uses a logical operation for its conditional operation.

  This sets the opacity of an image on the watch face to 100, if the battery percentage is greater than or equal to 50% and less than or equal to 75%. Otherwise, set the opacity to 0.

Nested ternary operations

Ternary operations can be nested within the result operand of another ternary operation.

For example, if you have two ternary operations (a? b: c) and (x? y: z), you could create the following nested ternary operations:

• conditional_operation? (a? b: c): result_if_false

  If conditional_operation is true, then check conditional operation a.

  If a is true, the result is b. If a is false, the result is c.

  If conditional_operation is false, the result is result_if_false.

• conditional_operation? result_if_true: (x? y: z)

  If conditional_operation is true, the result is result_if_true.

  If conditional_operation is false, then check conditional operation x.

  If x is true, the result is y. If x is false, the result is z.

• conditional_operation? (a? b: c): (x? y: z)

  If conditional_operation is true, then check conditional operation a.

  If a is true, the result is b. If a is false, the result is c.

  If conditional_operation is false, then check conditional operation x.

  If x is true, the result is y. If x is false, the result is z.