millisecondsToDays — GTM Variable Template for Date

VARIABLES › DATE

millisecondsToDays EXTENDED Date

Direct (.tpl) Apply (.tpl) Add to GTM

Converts milliseconds to days.

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When to Use This

Time Operations

Measure durations, calculate elapsed time, and format timestamps.

Type Conversion

Safely convert between data types — strings, numbers, booleans, arrays, objects.

Date & Time

Calculate durations, differences, and time-based operations on date values.

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Examples

Milliseconds to 1 day▶ Try

INPUT

Number of Milliseconds: 86400000

OUTPUT

1

Milliseconds to 7 days▶ Try

INPUT

Number of Milliseconds: 604800000

OUTPUT

7

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Live Sandbox

This is what you'll see when you open this variable in Google Tag Manager. Hover the icons for details.

millisecondsToDays

Read-Only Try Live

Number of Milliseconds

💾 The number of milliseconds to convert to days.

Supported formats:
  ✓ Number
  ✓ String

Input Setup

Input Function (optional)

⚙️ Optional pre-processing function applied to the input before internal logic (e.g., convert object to string, normalize case). Internal transformations such as case handling will still apply afterward.

Result Handling

Output Function (optional)

⚙️ Optional function to apply to the result before returning it (e.g., str => str + ' €', val => val !== undefined for boolean conversion). Useful for chaining transformations on the output.

Number of Milliseconds number

💡 Type any text to see the result update live

🎯 Using special value — click input to type instead

Test with:

Falsy undefined null "" empty 0 false NaN

Truthy true 42 "hello" {} empty [] empty {a:1} [1,2,3]

🔗 Result Handling — Chain Variables

Chain apply-mode variables to the output. Each variable receives the result of the previous one.

millisecondsToDays()

+ Chain another variable

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Related Variables

Same category: Date

→ addDays → basicDateToExtended → calculateDaysDifference → calculateLeadTime → currentTimestamp → dateToUnixTimestamp → daysToMilliseconds → extendedDateToBasic → getDayIndexFromDateString → getDayName → getDayNameFromDateString → getDayNameShort → getHourOfDay → getMonthName → getMonthNameShort → hoursToMilliseconds → isBusinessHours → isWeekend → millisecondsToHours → millisecondsToMinutes → millisecondsToSeconds → minutesToMilliseconds → reverseDateCompactDay1st → reverseDateCompactYear1st → reverseDateSlash → secondsToMilliseconds → subtractDays → timestampToDayIndex → unixTimestampToDate

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Under the Hood

📜 View Implementation Code

/**
* Converts a number of milliseconds to days.
*
* @param {string|number} data.src - The number of milliseconds to convert to days.
* @param {Function|string} [data.out] - Optional output handler: function to transform result or string with format.
*
* Direct-mode specific parameters:
* @param {Function} [data.pre] - Optional pre-processor function to transform src before conversion.
*
* @returns {number|undefined} The time in days, or undefined if input is not a valid number.
*
* @framework ggLowCodeGTMKit
*/
const makeNumber = require('makeNumber');

const millisecondsToDays = function(timeValue) {
   const timeNum = makeNumber(timeValue);
   if (timeNum === timeNum) {
       return timeNum / (1000 * 60 * 60 * 24);
   }
   return undefined;
};

const safeFunction = fn => typeof fn === 'function' ? fn : x => x;
const out = safeFunction(data.out);

// ===============================================================================
// millisecondsToDays - Direct mode
// ===============================================================================
const applyCast = (castFn, value) => safeFunction(castFn)(value);
const value = applyCast(data.pre, data.src);
return out(millisecondsToDays(value));
// ===============================================================================
// millisecondsToDays() – Apply Mode
// ===============================================================================
/*
return function(value) {
  return out(millisecondsToDays(value));
};
*/

🧪 View Test Scenarios (5 tests)

✅ '[example] Milliseconds to 1 day'
✅ '[example] Milliseconds to 7 days'
✅ String milliseconds - converts to days
✅ Partial day milliseconds - converts to decimal days
✅ Invalid string input - returns undefined