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Temperature & Time Converter Tools

Convert temperatures and time units instantly. Transform Celsius to Fahrenheit, convert time durations, handle timezones, and work with Unix timestamps for global coordination.

8 min read
Updated 2025-12-13

Temperature and time conversions help navigate different measurement systems and coordinate across time zones. Recipes specify oven temperatures in Celsius or Fahrenheit depending on region, project timelines need hours converted to days, international meetings require timezone coordination, and developers work with Unix timestamps for date calculations.

These converters handle temperature scales (Celsius, Fahrenheit), time durations (seconds, minutes, hours, days, weeks), timezone translations across cities worldwide, and Unix timestamp conversions to readable dates. All tools use accurate conversion formulas and account for regional variations.

Perfect for cooks adapting international recipes, travelers coordinating across time zones, developers working with timestamps, project managers calculating durations, and anyone working with temperature or time across different standards.

How to Use These Tools

Step-by-step guidance and best practices for getting the most out of this collection

Celsius to Fahrenheit conversion uses the formula F = (C × 9/5) + 32, where freezing point differs (0°C = 32°F) and scaling varies (100°C = 212°F). The Celsius to Fahrenheit Converter handles oven temperatures for recipes, weather forecasts, body temperature readings, and scientific measurements. Remember key points: water freezes at 0°C/32°F, room temperature around 20°C/68°F, body temperature 37°C/98.6°F, and water boils at 100°C/212°F. Most countries use Celsius except the US.

Time duration conversions transform between seconds, minutes (60 seconds), hours (60 minutes), days (24 hours), weeks (7 days), months (variable), and years (365.25 days average). The Time Converter helps calculate project durations, workout times, travel durations, and time tracking. Note that months vary (28-31 days), years have leap years, and some calculations need calendar-aware logic. For precise duration arithmetic, stick to fixed units like hours or days.

Timezone conversion accounts for UTC offsets and daylight saving time (DST) adjustments across regions. The Time Zone Converter translates times between cities, scheduling international meetings, coordinating deadlines, and planning travel itineraries. Major zones include EST/EDT (UTC-5/-4), PST/PDT (UTC-8/-7), GMT/BST (UTC+0/+1), and CET/CEST (UTC+1/+2). DST transitions occur on different dates regionally, complicating conversions near transition periods.

Unix timestamp conversion translates seconds since January 1, 1970 (Unix epoch) to human-readable dates. The Timestamp Converter helps developers debug date issues, analyze logs, compare timestamps, and work with APIs returning epoch times. Timestamps ignore timezones (always UTC), preventing timezone confusion in distributed systems. JavaScript uses milliseconds since epoch, while Unix systems use seconds. Always verify which unit your system expects.

Temperature Conversion

Convert between Celsius and Fahrenheit

Celsius to Fahrenheit Converter

Shift temperatures between Celsius and Fahrenheit scales accurately

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Time Duration

Convert between time units

Time Converter

Transform time units between seconds, minutes, hours, days, weeks

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Timezone & Timestamp

Handle global time coordination

Time Zone Converter

Adjust times across world cities and time zones with DST support

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Timestamp Converter

Transform Unix timestamps to readable dates and back

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Popular Workflows

Common ways professionals use these tools together

Adapt International Recipe

  1. 1

    Convert oven temperature to Fahrenheit

    Celsius to Fahrenheit Converter

  2. 2

    Convert cooking duration if needed

    Time Converter

Schedule Global Meeting

  1. 1

    Find suitable time across all timezones

    Time Zone Converter

  2. 2

    Verify DST status for meeting date

    Time Zone Converter

Debug Timestamp Issue

  1. 1

    Convert Unix timestamp to readable date

    Timestamp Converter

  2. 2

    Verify timestamp is in correct timezone

    Time Zone Converter

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Frequently Asked Questions

Why is Fahrenheit still used in the US?

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The US adopted Fahrenheit before the metric system became standard. Changing would require updating infrastructure, education, and public habits at enormous cost. Fahrenheit offers finer granularity for everyday temperatures (0-100°F covers typical weather), though Celsius is simpler (water freezes at 0, boils at 100). Scientific work in the US uses Celsius.

How do I account for daylight saving time?

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DST shifts clocks forward one hour in spring and back in fall, but dates and participation vary by region. The Time Zone Converter automatically handles DST for supported cities. Not all regions observe DST: Arizona, Hawaii, and many tropical countries stay on standard time year-round. Always specify dates when converting times during DST transition periods.

What is UTC and how does it differ from GMT?

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UTC (Coordinated Universal Time) is the modern time standard, while GMT (Greenwich Mean Time) is the old UK standard. For practical purposes, they are equivalent (both at 0° longitude). UTC never observes DST, making it ideal for timestamps and international coordination. Use UTC for technical systems, GMT when referencing UK time specifically.

How do Unix timestamps handle leap seconds?

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Unix timestamps ignore leap seconds, treating all days as exactly 86,400 seconds. This creates small discrepancies with atomic time but simplifies calculations. For most applications, this does not matter. Leap seconds occur irregularly (roughly every 18 months) when Earth's rotation requires adjustment. Only specialized scientific applications need leap second precision.

Can I convert months to days accurately?

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Not precisely, since months vary from 28-31 days. Use 30 days for rough estimates, but for exact calculations, convert specific dates considering the actual month lengths. February complicates this further with 28 days (29 in leap years). Libraries and date tools handle this automatically. For project planning, use weeks (fixed 7 days) rather than months for precision.

Why do some regions use half-hour timezones?

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A few regions (India UTC+5:30, Australia Central UTC+9:30, Newfoundland UTC-3:30) use half-hour offsets to better align daylight with local noon. Quarter-hour offsets exist too (Nepal UTC+5:45). These arose from geographic or political considerations. Always use timezone databases rather than assuming whole-hour offsets. The Time Zone Converter handles these correctly.

How do I convert between 12-hour and 24-hour time?

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12-hour time uses AM/PM (1-12), while 24-hour uses 0-23. Midnight is 12:00 AM or 00:00. Noon is 12:00 PM or 12:00. For PM times 1-11, add 12 (1:00 PM = 13:00). For AM times 1-11, use as-is (1:00 AM = 01:00). 12-hour format is common in US, while 24-hour is standard in military, aviation, and most countries for clarity.

Are temperature conversions reversible without loss?

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Yes, temperature conversions are mathematically exact and fully reversible. Unlike some unit conversions that involve rounding, Celsius and Fahrenheit use precise formulas. However, displaying rounded values may introduce apparent inconsistencies. For example, 20°C = 68°F exactly, but if shown rounded, reversing might display 19.99°C. Store precise values to avoid rounding artifacts.

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