Fletcher Langley, Time & Scheduling Specialist

Author & reviewer

Fletcher Langley

Time & Scheduling Specialist · Portland, Oregon

Operations and workforce-systems specialist with 14+ years inside shift-based industries and payroll platforms. Fletcher writes and reviews the calculators, converters, and guides on 24hourto12hour.com — covering clock formats, duration math, overnight shifts, and decimal hours.

@Fletcher_Langle Independent scheduling & time-accuracy consultant

“Most time-sheet mistakes I saw weren’t math errors — they were format confusion, ignored overnight crossover, or treating 8:30 as 8.30. These tools exist so that never has to happen again.”

14+
Years in shift ops & payroll systems
2011
On the shift floor since
3
Organizations’ time tools built & audited
BS
Industrial Engineering, 2012

Areas of expertise

The specific ground this site covers — and where Fletcher has spent his career.

12- / 24-hour clock formats Military time Overnight & multi-shift handovers Decimal payroll hours Timesheets & time cards Overtime rules Workforce scheduling systems Work measurement

Career & background

Fifteen years on shift floors and inside payroll systems shape every tool on this site.

  1. 2011
    Shift supervisor · 24-hour logistics warehouse

    Started on the floor, living the exact problems this site solves: clock-ins at 22:15, clock-outs at 06:40, unpaid breaks nobody remembered to subtract, and managers treating 8 hours 30 minutes as 8.30 decimal hours.

  2. 2012
    BS, Industrial Engineering

    A degree focused on process systems, work measurement, and scheduling — the same problems he was already handling on the warehouse floor, now with the theory behind them.

  3. 2014
    Into workforce systems

    Moved from the floor into operations analysis, then took ownership of timesheet accuracy, overtime rules, and the conversion layer between clock time and payroll — writing the internal calculators teams actually used, and fixing the quiet errors that cost people money.

  4. 2026
    Joined 24hourto12hour.com

    To write and review the site’s calculators, converters, and guides — from the perspective of someone who has had to defend a timesheet and explain why a shift that crossed midnight is still eight hours.

What I write & review here

Every tool below is built and checked against real shift-floor and payroll experience. These tools are planning and verification aids — not a substitute for your own payroll or scheduling system.

Hours Calculator Hours and minutes worked between a start and end time, with breaks. Time Duration Calculator The exact gap between two date-times, across days. Add & Subtract Time Move a time forward or back, with day changes flagged. Time Card Calculator A full week of shifts totalled into one figure. Military Time Converter Any 24-hour time read as its 12-hour equivalent. Military Time Chart The full reference chart, every hour mapped.

Credentials

  • BS, Industrial Engineering — 2012 (process systems, work measurement, scheduling)
  • 14+ years in shift operations and workforce systems (2011–present)
  • Designed and maintained internal time-conversion and timesheet tools for three organizations
  • Deep practical experience with 12-hour, 24-hour, and military formats, unpaid breaks, and decimal-hour payroll
  • Independent consultant on scheduling and time-accuracy systems

How these tools are kept accurate

Fletcher personally writes and reviews the calculators, converters, and guides on this site. Every worked example is verified by hand, clock formats follow recognised standards such as ISO 8601 for 24-hour notation, and each tool is re-checked whenever it changes. You can read the full editorial policy for how content is produced and reviewed.

Have a correction or a question about a calculation? Reach Fletcher on X or through the site’s contact page — accuracy feedback is genuinely welcome.